Summer Birds From the Yucatan Peninsula, Mexico

Chapter II: Part 2

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_Formicarius analis_ (d'Orbigny and Lafresnaye): Black-chinned Antthrush.--Specimen (1): [Male], 40624, 56.0 gm. (July 29), Pueblo Nuevo X-can.

_Pachyramphus major itzensis_ Nelson: Mexican Becard.--Previous records of breeding in this species are provided by a female obtained on July 12 (Paynter, 1955a:182) and a male taken on June 9 (Paynter, 1955b).

Specimen (1): [Male], 40625, testis 9 x 5 mm., 22.1 gm. (July 21),
Piste.

_Platypsaris aglaiae_ (Lafresnaye): Rose-throated Becard.--All specimens have extensively worn plumage.

Specimens (3): [Male], 40628, 33.5 gm. (July 10), 5 km. S
Champoton; [Female], 40626, ovary 6 x 3 mm., brood patch, 34.0 gm.
(July 20), [Female], 40627, ovary inactive, 33.9 gm. (July 26);
3-1/2 km. N and 6-1/2 km. W Piste.

_Tityra semifasciata personata_ Jardine and Selby: Masked Tityra.-- Previously, breeding information for this species has been available only for March (Paynter, 1955a:184). Adults were observed feeding young fledglings 7-1/2 km. W Escarcega on July 15, and a juvenile was taken. Gonads of males were in full breeding condition.

Specimens (5): [Male], 40630, testis 13 x 6 mm., 81.3 gm. (July
14), sex? 40631, juv., 55.5 gm. (July 15), [Male], 40632, testis 9
x 5 mm., 73 gm., molting--1st and 2nd primaries ensheathed (July
15), and [Female], 40633, 84.7 gm. (July 16), 7-1/2 km. W
Escarcega; [Female], 40629, ova to 1 mm., 80.0 gm. (July 23),
Piste.

_Erator inquisitor fraserii_ (Kaup): Black-capped Tityra.--Breeding has been recorded by Paynter (1955a:185) on April 26. A moderately enlarged testis (probably regressing) was noted in the specimen from Piste, on July 21.

Specimens (2): [Female], 40635, 51.8 gm. (July 15), 7-1/2 km. W
Escarcega; [Male], 40634, testis 6 mm., 51 gm., molting--6th
primaries ensheathed (July 21), Piste.

_Pipra mentalis mentalis_ Sclater: Red-capped Manakin.--The specimens here reported seem to be the first from the peninsula in which reproductive activity has been recorded.

Specimens (2): [Male], 40637, testis 5 x 3 mm., 14.0 gm. (July 29),
Pueblo Nuevo X-can; [Male], 40636, testis 5 x 2 mm., 14.6 gm.
(August 3), 4 km. WSW Puerto Juarez.

_Pyrocephalus rubinus_ (Boddaert): Vermillion Flycatcher.--This species was seen only in the arid scrub 2-13 km. WSW of Sisal. Breeding seemingly had ended by early August, as evidenced by four adults that showed no gonadal activity and were in advanced stages of molt.

Specimens (5): [Female], 40638, juv., 12.1 gm. (August 7), 1-1/2
mi. S Sisal; [Female], 40640, ovary inactive, 14.1 gm.,
molting--6th primaries ensheathed (August 10), [Female], 40641,
ovary inactive, 13.9 gm., molting--7th primaries ensheathed (August
10), and [Male], 40642, testis 2 mm., 14.6 gm., molting--5th
primaries ensheathed (August 10), 13 km. WSW Sisal; [Female],
40639, testis 1 mm., 14.0 gm., molting--7th primaries ensheathed
(August 18), 2 km. SW Sisal.

_Tyrannus melancholicus chloronotus_ Berlepsch: Tropical Kingbird.--Most specimens were molting. A male and two females from Piste taken on July 21 and a female from Pueblo Nuevo X-can (July 29) had slightly enlarged (probably regressing) gonads. Three immatures were collected and adults were seen feeding young fledglings at Piste. There seems to be no other breeding records from the peninsula.

Specimens (10): [Female], 40650, 42 gm., (July 10), 5 km. S
Champoton; [Female], 40752, ovary inactive, 43.4 gm., molting--4th
primaries ensheathed (July 14), and [Male], 40651, imm., 42.5 gm.
(July 15), 6-7-1/2/# km. W Escarcega; [Female], 40645, ovary
slightly enlarged (8 x 3 mm.), 47.5 gm. (July 21), [Female], 40643,
ova to 1 mm., 39.3 gm. (July 21), [Male], 40644, testis 10 x 7 mm.,
43.1 gm., starting to molt--1st primaries ensheathed (July 21), and
[Female], 40646, imm., (July 26), Piste; [Female], 40648, ova to 1
mm., 37.4 gm. (July 29), Pueblo Nuevo X-can; [Male], 40647, imm.,
38.4 gm. (August 14), and [Female], 40649, 44.4 gm., molting--only
outer 3 pairs of rectrices present and are ensheathed basally, 6th
and 7th primaries ensheathed (August 15), 4 km. NNE Felipe Carrillo
Puerto.

_Myiodynastes luteiventris luteiventris_ Sclater: Sulfur-bellied Flycatcher.--The latest breeding record given by Paynter (1955a:191) is for the last week in June. A male taken on July 31 had enlarged testes. None of the following specimens was in the process of molt.

Specimens (4): [Female], 40655, 44.5 gm. (July 10), 5 km. S
Champoton; [Female], 40656, ovary slightly enlarged (8 x 4 mm.),
47.0 gm. (July 15), 7-1/2 km. W Escarcega; [Female], 40654, testis
10 x 4 mm., 39 gm. (July 31), Pueblo Nuevo X-can.

_Megarhynchus pitangua mexicanus_ (Lafresnaye): Boat-billed Flycatcher.--I know of no previous breeding record for this species on the peninsula. The female obtained on July 25 was observed feeding young.

Specimens (2): [Female], 40658, 57.6 gm. (July 11), 5 km. S
Champoton; [Female], 40657, ovary 10 x 5 mm., 59.8 gm. (July 25),
Cenote Seco, 2 km. E Chichen-Itza.

_Myiozetetes similis texensis_ (Giraud): Vermilion-crowned Flycatcher. --Paynter (1955a:192) reported this species breeding in mid-May. A male taken on July 17 west of Escarcega had enlarged (probably regressing) testes and indicates breeding later than May.

Specimens (3): [Male], 40660, testis 6 x 3 mm., 32.0 gm. (July 17),
and sex? 40661, 33.8 gm., molting--5th primaries ensheathed (July
17), 1 km. N, 13 km. W Escarcega; [Male], 40659, imm., testis 2 x 1
mm., 27.6 gm. (July 29), Pueblo Nuevo X-can.

_Pitangus sulphuratus guatimalensis_ (Lafresnaye): Great Kiskadee.-- Apparently our specimens, which were in the late stages of breeding, are the first evidence of reproduction for the species on the peninsula.

Specimens (4): [Female], 40663, ova to 1 mm., 50.7 gm. (July 9),
and [Male], 40664, right testis 12 mm., 65.0 gm., body feathers in
early stages of molt (July 9), 5 km. S Champoton; [Male], 40665,
testis 5 mm., 61.9 gm., molting--middle pair of rectrices are new,
6th primaries ensheathed (July 15), 7-1/2 km. W Escarcega; sex?
40662, 59.5 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto.
Mallophaga: _Philopterus_ sp.

_Myiarchus tyrannulus cooperi_ Baird: Wied Flycatcher.--This species was especially common among the coco palms on Isla del Carmen and Isla Cozumel.

Specimens (5): [Male], 40667, 36.7 gm. (July 8), [Male], 40668,
36.6 gm. (July 8), sex? 40669, 39.4 gm. (July 8), and [Female],
40670, 37.3 gm. (July 8), all from 1 km. SW Puerto Real, Isla del
Carmen; [Female], 40666, ovary inactive, 34.9 gm. (August 10), 3
km. N San Miguel, Isla Cozumel.

_Myiarchus tuberculifer platyrhynchus_ Ridgway: Olivaceous Flycatcher. --Breeding specimens of this species have been known previously from April and May (Paynter, 1955a:196); records listed beyond extend the season nearly three months.

Specimens (7): [Female], 40673, ova to 5 mm. (July 10), and
[Female], 40674, ovary 7 x 3 mm. (ova to 1 mm.) (July 11), 5 km. SW
Champoton; [Female], 40745, ovary inactive, 17.5 gm., starting to
molt--1st, 2nd, and 3rd primaries ensheathed (July 16), 7-1/2 km. W
Escarcega; [Female], 40671, imm., 16.1 gm. (July 20) Cenote Seco, 2
km. E Chichen-Itza; [Male], 40746, 18.2 gm. (July 22), Piste;
[Female], 40672, ovary inactive, 17.7 gm., molting--5th and 6th
primaries and 1st secondaries ensheathed (August 15), 4 km. NNE
Felipe Carrillo Puerto; [Male], 40675, left testis 13 mm., right
testis 10 mm., 17.5 gm. (August 8), 3-1/2 km. N San Miguel, Isla
Cozumel.

_Contopus cinereus_ (Spix): Tropical Pewee.--The regressing gonads of the male taken on July 21 in an early stage of molt suggests breeding on the peninsula.

Specimens (2): [Male], 40676 testis 6 x 3 mm., 11.5 gm., starting
to molt--1st and 2nd primaries ensheathed (July 21), 6-1/2 km. W
Piste; [Male], 40677, testis 1 mm., 12.6 mm., molting--4th, 5th,
and 6th primaries and 2nd secondaries ensheathed (August 14), 4 km.
NNE Felipe Carrillo Puerto.

_Tolmomyias sulphurescens_ (Spix): Sulphury Flat-Billed Flycatcher.-- Paynter (1955a:201) presented breeding records for this species from mid-April to late June. My specimens seem to indicate that breeding extends at least into July.

Specimens (6): [Female], 40683, juv., 14.0 gm. (July 21), [Male],
40684, juv. (remiges and rectrices ensheathed basally), 14.0 gm.
(July 21), and [Male], 40682, testis 8 x 4 mm., 13.7 gm. (July 26),
Piste and 3-1/2 km. N Piste; [Male], 40685, testis 7 x 4 mm., 15.3
gm., molting--1st and 2nd primaries ensheathed (July 28), and
[Female], 40686, ovary inactive (July 28), Pueblo Nuevo X-can;
[Male], 40687, imm., 16.0 gm. (August 15), 4 km. NNE Felipe
Carrillo Puerto. Mallophaga: _Philopterus_ sp. July 28; _Myrsidea_
sp. July 28.

_Myiopagis veridicata_ (Vieillot): Yellow-crowned Elaenia.--The only previous breeding record is of a male that was taken on April 29. My only specimen has nearly fully enlarged testes.

Specimen (1): [Male], 40688, testis 7 x 4 mm., 13.1 gm. (July 17),
1 km. N, 13 km. W Escarcega.

_Progne subis subis_ (Linnaeus): Purple Martin.--A large migrant flock of several thousand individuals of this species was present for several days in August at Rancho San Miguel.

Specimens (3): [Female], 40723, ovary inactive, 48.6 gm. (August
14), [Female], 40724, 51.8 gm. (August 17), and [Female], 40725,
imm. skull, 52.1 gm. (August 17), 4 km. NNE Felipe Carrillo Puerto.

_Petrochelidon fulva citata_ Van Tyne: Cave Swallow.--Throughout our stay at Piste, large numbers of Cave Swallows were seen flying in and out of the small opening of a well-like _cenote_ in the center of the village. Specimens were easily collected in a mist net placed across the opening. No young Cave Swallows were taken and gonads of adults were in various stages of reproductive activity. A few individuals taken were beginning to molt. Probably the swallows were nesting in the _cenote_ although the nests were inaccessible to view. Previous breeding records are for April (Paynter, 1955a:209).

Twenty-two specimens were collected, of which the following were
taken at Piste, July 21-25: [Male], 40693, testis 6 x 3 mm., 18.4
gm.; [Male], 40696, 16.4 gm.; [Female], 40697, 18.2 gm.; [Male],
40695, 15.0 gm.; [Female], 40690, ovary inactive, 18.4 gm.,
molting--2nd primaries ensheathed; [Male], 40692, testis 5 x 3 mm.,
17.9 gm.; [Female], 40698, 18.3 gm.; [Female], 40702, ovary 7 x 3
mm., 18.9 gm.; [Female], 40703, ovary 6 x 3 mm., 17.5 gm.; [Male],
40713, testis 3 mm., 18.4 gm.; [Female], 40704, 16.5 gm.; [Male],
40705, 20.3 gm.; [Male], 40699, testis 2 mm., 18.6 gm.,
molting--2nd primaries ensheathed; [Female], 40700, ovary 5 x 3
mm., 18.5 gm., molting--1st primaries ensheathed; [Female], 40701,
ovary 5 x 3 mm., 16.5 gm., molting--1st primaries ensheathed;
[Male], 40707, testis 7 x 5 mm., 19.9; [Male], 40708, testis 4 x 3
mm., 18.4 gm.; [Female], 40709, ovary 4 x 3 mm., 18.0 gm.; sex?
40711, 18.3 gm., molting--1st and 2nd primaries ensheathed.

Additional specimens are: [Female], 40718, 16.5 gm., molting--3rd
primaries ensheathed (August 16), and [Female], 40719, 18.5 gm.,
molting 1st primaries ensheathed (August 16), 4 km. NNE Felipe
Carrillo Puerto; [Male], 40689, testis 1 mm., 16.2 gm.,
molting--2nd primaries ensheathed (August 10), 13 km. WSW Sisal.
Mallophaga: _Philopterus excisus_, July 21; _Myrsidea_ sp. July 21
and 25.

_Stelgidopteryx ruficollis_ Audubon: Rough-winged Swallow.--Previous records indicate that three subspecies of this species occur on the Yucatan Peninsula (Paynter, 1955a:209). One of these, _S. r. ridgwayi_, is resident. _S. r. serripennis_, representing the breeding population occurring from British Columbia and New Hampshire over much of the United States to central California, central Texas, and the Gulf states, has been taken on the peninsula in winter. Paynter referred two specimens taken in late September and three January-taken specimens to _S. r. stuarti_, the highland race that breeds from the mountains of southern Veracruz to Guatamala.

Allan R. Phillips had identified two immature individuals (40694 and 40712) from Piste as _S. r. stuarti_; one specimen from Puerto Juarez also is an immature and is nearly identical to those from Piste. Two adults from Piste (40691 and 40710) are noticeably darker dorsally than the immatures but are molting extensively and their identification to subspecies is equivocal. Two other adults (40706 and 40715) were prepared as skeletons.

Although mid-July seems early for _S. r. stuarti_ to be present on the peninsula it is not too surprising since the three specimens positively identified are immature birds and young possibly arrive earlier than do adults. But, the immature specimens possibly are atypical individuals of the resident population of _S. r. ridgwayi_.

Except for the immature individual from 5 km. WSW Puerto Juarez, all specimens were taken in mist nets over the _cenote_ at Piste where _Petrochelidon fulva_ also was obtained.

Specimens (7): [Male], 40694, imm., 16.2 gm., [Female], 40691,
ovary inactive, 16.4 gm., molting--general body molt, 5th primaries
and middle pair of rectrices ensheathed, [Female], 40712, imm.,
14.5 gm., [Female], 40706, 14.8 gm., [Male], 40715, 16.4 gm.,
[Male], 40710, 18.5 gm., molting--general body molt, 1st primaries
and middle pair of rectrices ensheathed, all from Piste, July 21
and 25; [Male], 40720, imm., 15.5 gm. (August 1), 5 km. WSW Puerto
Juarez.

_Hirundo rustica erythrogaster_ Boddaert: Barn Swallow.--Specimen (1): [Female], 40721, imm., 7.3 gm. (August 18), apparently an early migrant, 2 km. WSW Sisal.

_Iridoprocne albilinea_ (Lawrence): Mangrove Swallow.--Specimen (1): [Female], 40722, imm. (July 7), Puerto Real, Isla del Carmen.

_Cissilopha yucatanica_ (Dubois): Yucatan Jay.--Heretofore, breeding activity has been recorded only in March (Paynter, 1955a:217). All specimens in my collection have extensively worn plumage and were beginning to molt.

Specimens (6): [Male], 40726, left testis 9 x 7 mm., right testis 4
x 2 mm., brood patch, 122.3 gm., molting--1st and 2nd primaries
ensheathed (July 10), 5 km. S Champoton; [Male], 40727, testis 5 x
3 mm., brood patch, 125.6 gm., molting--1st and 2nd primaries
ensheathed (July 11), 5 km. SW Champoton; [Female], 40728, 109.8
gm. (July 13), and sex? 40729, 109.5 gm. (July 15), 7-1/2 km. W
Escarcega; [Female], 40730, imm., 110.3 gm. (July 21), Piste;
[Female], 40731, ovary inactive, brood patch refeathering, 121 gm.,
molting--2nd and 3rd primaries ensheathed (August 16), 4 km. NNE
Felipe Carrillo Puerto.

_Cyanocorax yncas maya_ (van Rossem): Green Jay.--There are records of breeding by this species on the peninsula for April 28 and 29, and June 4 (Paynter, 1955a:215, 216).

Specimens (4): [Male], 40740, testis 5 x 3 mm., 81.2 gm. (July 16),
7-1/2 km. W Escarcega; [Female], 40739, juv., 62.3 gm. (July 21),
[Male], 40737, 64.5 gm. (July 21), and [Female], 40738, 64.1 gm.
(July 21), Piste.

_Psilorhinus morio_ (Wagler): Brown Jay.--Specimens (3): [Female], 40742, 203.5 gm. (July 13), [Male], 40743, juv., 170 gm. (July 14), 7-1/2 km. W Escarcega; [Male], 40741, juv., 193.7 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto.

_Thryothorus lucovicianus albinucha_ (Cabot): Carolina Wren.--This wren formerly was considered to be a species (_T. albinucha_). In the light of evidence presented by Lowery and Berrett (1963), it is advisable to follow Paynter (1955a:219) and consider _albinucha_ to be a subspecies of _T. ludovicianus_. The only previous evidence of breeding by this species on the peninsula was a male having slightly enlarged gonads taken by Paynter (1955a:219) on March 9.

Specimen (1): [Male], 40754, juv., 16.8 gm. (August 14), 4 km. NNE
Felipe Carrillo Puerto.

_Thryothorus maculipectus canobrunneus_ (Ridgway): Spotted-breasted Wren.--According to Paynter (1955a:220) this species breeds from mid-March to May 23. Gonads were moderately active in our specimens as early as mid-July.

Specimens (4): [Female], 40758, ovary (6 x 3 mm.) granular (July
14), and [Male], 40757, testis 5 x 3 mm., 15.3 gm. (July 14), 7-1/2
km. W Escarcega; [Female], 40755, ovary 6 x 3 mm. (ova to 1 mm.),
12.7 gm. (July 21), Piste; [Male], 40756, ovary 4 x 3 mm., 16.8 gm.
(August 3), 4 km. WSW Puerto Juarez.

_Troglodytes musculus_ (Naumann): Southern House Wren.--Specimen (1): [Female], 40760, juv. (August 2), 4 km. WSW Puerto Juarez.

_Troglodytes beani_ (Ridgway): Cozumel Wren.--Specimens (2): [Female], 40761, 13.3 gm. (August 9), and [Male], 40762, imm., 13.6 gm. (August 9), 3-1/2 km. N San Miguel, Isla Cozumel.

_Campylorhynchus yucatanicus_ (Hellmayr): Yucatan Wren.--This species was abundant in the coastal scrub west of Sisal where some breeding activity was noted. A few individuals were carrying nest material and several were feeding young. There were many old and abandoned nests and apparently the breeding season was nearly over. The only previous breeding record is for March 19 when a newly completed nest was found (Paynter, 1955a:218).

Specimens (4): [Male], 40750, imm., 32.4 gm. (August 7), 1-1/2 mi.
SW Sisal; [Female], 40751, imm., 31.2 gm. (August 18), 2 km. WSW
Sisal; [Female], 40752, ovary 7 x 3 mm., 40 gm. (August 9), 4.3 km.
WSW Sisal; [Female], 40753, 31.0 gm. (August 11), 6-1/2 km. WSW
Sisal.

_Melanoptila glabrirostris cozumelana_ (Paynter): Black Catbird.-- Apparently the only previous record of breeding by this species was Paynter's (1955b) mention of a male from Quintana Roo with enlarged gonads on June 26. The three adults in the collection here reported on were in nearly full reproductive activity.

Specimens (4): [Male], 40764, imm., 40.5 gm. (August 8), [Female],
40767, testis 8 x 4 mm., 42.0 gm., heavy fat (August 8), [Female],
40765, ovary active (oviduct enlarged), brood patch, 35.2 gm.
(August 10), and [Male], 40766, testis 9 x 6 mm., 35 gm. (August
10), from 2-1/2-3-1/2 km. N San Miguel, Isla Cozumel.

_Mimus gilvus_ (Vieillot): Tropical Mockingbird.--The only breeding record heretofore is by Paynter (1955a:226) of newly-fledged juveniles taken on May 26 and 29. Gonads in our adults were moderately active; feathers were extremely worn, but molting was not evident.

Specimens (4): [Male], 40771, testis 9 x 6 mm., 51.0 gm. (July 9),
5 km. S Champoton; [Female], 40770, ovary moderately active (ova to
2 mm.), brood patch, 42 gm., moderate fat (August 9), 3-1/2 km. N
San Miguel, Isla Cozumel; [Female], 40768, imm., 45.2 gm., moderate
fat (August 18), 2 km. WSW Sisal; [Male], 40769, testis 10 x 5 mm.,
51.8 gm. (August 9), 13 km. WSW Sisal. Mallophaga: _Myrsidea_ sp.,
July 9.

_Toxostoma guttatum_ (Ridgway): Cozumel Thrasher.--Our specimen had enlarged testes and seems to represent the first record of breeding activity in the species.

Specimen (1): [Male], 40772, testis 7 x 4 mm., 49.5 gm. (August
10), 3-1/2 km. N San Miguel, Isla Cozumel.

_Turdus grayi_ Bonaparte: Clay-colored Robin.--Four adults were in full breeding condition.

Specimens (6): [Male], 40780, testis 13 x 8 mm., brood patch (July
10), 5 km. S Champoton; [Female], 40781, ova to 8 mm., 79.6 gm.
(July 15), 5 km. SW Escarcega; [Female], 40776, 61.3 gm. (July 21),
Piste; [Female], 40777, imm., 63.4 gm. (July 20), 61/2 km. W Piste;
[Male], 40779, testis 14 x 8 mm., brood patch, 68.5 gm. (July 30),
and [Male], 40778, testis 13 x 11 mm., 71.5 gm. (July 28), Pueblo
Nuevo X-can.

_Polioptila caerulea_ (Linnaeus): Blue-gray Gnatcatcher.--A fledgling taken at Piste was barely flying with remiges and rectrices ensheathed basally. Previous breeding records are for April 11 and 27 (Paynter, 1955a:231). A male taken on August 10 on Isla Cozumel had nearly completed molting into winter plumage.

Specimens (8): [Female], 40788, fledgling, 5.0 gm. (July 20), 6-1/2
km. W Piste; [Male], 40787, testis 2 x 1 mm., 5.6 gm. (July 21),
[Male], 40785, juv., 5.8 gm. (July 22), and [Female], 40786, 5.6
gm. (July 22), Piste; [Female], 40791, juv., 5.6 gm. (August 8),
[Male], 40790, juv., 5.8 gm. (August 8), [Female], 40789, 5.7 gm.
(August 9), and [Male], 40792, 5.3 gm., molting--7th primaries
ensheathed (August 10), from {2-1/2}-{3-1/2} km. N San Miguel, Isla
Cozumel.

_Polioptila albiloris_ Lawrence: White-lored Gnatcatcher.--This species was abundant in the arid scrub along the coast in the vicinity of Sisal.

Specimens (2): [Male], 40783, testis 1 mm., 6.2 gm. (August 7),
1-1/2 mi. S Sisal; [Male], 40784, testis 1 mm., 5.8 gm. starting to
molt--1st and 2nd primaries ensheathed (August 10), 13 km. WSW
Sisal.

_Ramphocaenus rufiventris_ (Bonaparte): Long-billed Gnatwren.--Specimen (1): [Female], 40793, imm. skull, 9.8 gm. (July 15), 7-1/2 km. W Escarcega.

_Cyclarhis gujanensis insularis_ Ridgway: Rufous-browed Pepper-shrike. --Specimen (1): [Male], 40794, testis 2 mm., 37.8 gm., molting--4th primaries ensheathed (August 9), 4 km. N San Miguel, Isla Cozumel.

_Vireo bairdii_ (Ridgway): Cozumel Vireo.--Specimens (4): [Female], 40795, ovary inactive, 12.7 (August 8), [Male], 40796, testis 2 mm., 12.6 gm., molting--3rd and 4th primaries ensheathed (August 10), [Female], 40797, ovary inactive, 12.5 gm., molting--3rd primaries ensheathed (August 10), and [Male], 47098, imm., 13.1 gm. (August 10), from 2-1/2-3-1/2 km. N San Miguel, Isla Cozumel.

_Vireo pallens semiflavus_ (Salvin): Mangrove Vireo.--Paynter (1955a:236) noted breeding by this species from April 7 through June.

Specimens (2): [Female], 40800, ova to 3 mm., oviduct enlarged
(July 8), Isla del Carmen; [Female], 40799, ovary inactive, 11.1
gm., molting--4th primaries ensheathed (August 2), Isla Mujeres.

_Vireo flavoviridus flavoviridus_ (Cassin): Yellow-green Vireo.--Paynter's (1955a:238) data indicate breeding in this species from late May through June; our records indicate that the species breeds at least through July.

Specimens (12): [Male], 40812, testis 10 x 4 mm., 17.1 gm.,
molting--1st, 2nd, and 3rd primaries ensheathed (July 17), and
[Male], 40813, testis 7 x 4 mm., 18.2 gm. (July 17), 1 km. N, 13
km. W Escarcega; [Female], 40803, ovary 9 x 5 mm., ova to 1 mm.,
brood patch (July 21), [Male], 40805, testis 11 x 6 mm., 18.5 gm.
(July 21), [Male], 40804, 18 gm. (July 21), and [Female], 40802,
ovary slightly enlarged, molting--2nd and 3rd primaries ensheathed
(July 21), all from Piste; [Male], 40806, 17.5 gm., molting--1st
primaries ensheathed (July 21), 6-1/2 km. W Piste; [Female], 40808,
ovary 5 x 3 mm., 17.4 gm. (July 28), [Male], 40807, testis 5 x 3
mm., 17.7 gm., molting--3rd and 4th primaries ensheathed (July 28),
[Male], 40809, testis 2 x 1 mm., 17.5 gm. (July 29), and [Male],
40810, testis 3 x 2 mm., 18.7 gm., molting--1st, 2nd, 3rd, and 4th
primaries ensheathed (July 30), from Pueblo Nuevo X-can; [Male],
40811, testis 3 x 1 mm., 18.7 gm., molting--4th, 5th, and 6th
primaries and middle pair of rectrices ensheathed (August 14), 4
km. NNE Felipe Carrillo Puerto. Mallophaga: _Philopterus_ sp.
July 21.

_Vireo magister_ (Lawrence): Yucatan Vireo.--Breeding on the peninsula has not been recorded previously. A male, beginning to molt, taken on August 10 on Isla Cozumel had enlarged testes, which were apparently regressing.

Specimens (3): [Female], 40814, ovary inactive, 17.7 gm. (August
2), Isla Mujeres; sex? 40815, 19.5 gm. (August 9), and [Male],
40816, testis 6 x 3 mm., 20.2 gm., molting--1st, 2nd, and 3rd
primaries ensheathed (August 10), 3-1/2 km. N San Miguel, Isla
Cozumel.

_Cyanerpes cyaneus carneipes_ (Sclater): Blue Honeycreeper.--Paynter (1955a:283) collected specimens that were breeding in April. Testes were fully enlarged in two August-taken specimens and courtship rituals were observed in two pairs seen on August 3 at Puerto Juarez.

Specimens (3): [Male], 40817, 15.5 gm. (July 21), 6-1/2 km. W
Piste; [Male], 40818, testis 12 x 6 mm., 12.1 gm. (August 3), 4 km.
WSW Puerto Juarez; [Male], 40819, testis 8 x 6 mm., 11.6 gm.
(August 14), 4 km. NNE Felipe Carrillo Puerto.

_Coereba flaveola caboti_ (Ridgway): Bananaquit.--Specimen (1): [Female], 40820, ovary inactive, 5 x 3 mm., 11.0 gm., molting--1st and 2nd primaries ensheathed, 3rd and 4th primaries missing (August 10), 3-1/2 km. N San Miguel, Isla Cozumel.

_Dendroica petechia rufivertex_ (Ridgway): Yellow (Golden) Warbler. --Specimens (5): [Female], 40831, ovary inactive, 8.0 gm. (August 8), sex?, 40832, imm. (fresh, first winter plumage), 10 gm. (August 8), [Female], 40830, ovary inactive, 10.0 gm., molting--4th and 5th primaries ensheathed (August 9), [Female], 40833, ovary inactive, 8.5 gm. (August 9), and [Female], 40834, ovary inactive, 7.8 gm. (August 10), all from 3-1/2-4 km. N San Miguel, Isla Cozumel.

_Dendroica petechia bryanti_ (Ridgway): Yellow (Mangrove) Warbler.-- Previous records of breeding by this species are available for March 29 and 30 and May 16 (Paynter, 1955a:247). Breeding apparently continues at least into July. An adult male with moderately enlarged testes (probably regressing) was taken on July 7 at Zacatel, Campeche, and a juvenile was obtained 13 km. WSW Sisal on August 10. The male at Zacatal was in mangroves alongside the ferry landing (for the ferry from Isla del Carmen) and seems to be the first specimen of this subspecies recorded for the state.

Specimens (7): [Male], 40829, testis 4 x 2 mm., 11.1 gm.,
molting--1st, 2nd, and 3rd primaries ensheathed (July 7), Zacatal,
Campeche; [Male], 40823, imm., 10.0 gm. (August 9), [Male], 40824,
testis 1 mm., 13.0 gm., molting--4th and 5th primaries and middle
three rectrices ensheathed (August 9), [Male], 40826, juv., 10.1
gm. (August 10), [Male], 40827, imm. (fresh, first winter plumage),
10.2 gm. (August 10), sex?, 40825, 10.3 gm. (August 10), and
[Male], 40828, testis 2 mm., molting--7th, 8th, and 9th primaries,
2nd, and 3rd secondaries and outer pair of rectrices ensheathed
(August 11), all from 13 km. WSW Sisal.

_Seiurus motacilla_ (Vieillot): Louisiana Waterthrush.--Our specimen, apparently an early migrant, was taken near the aguada at Rancho San Miguel.

Specimen (1): [Male], 40835, testis minute, 19.9 gm. (August 14), 4
km. NNE Felipe Carrillo Puerto.

_Tangavius aeneus aeneus_ (Wagler): Red-eyed Cowbird.--A male having enlarged testes taken on August 14 seems to be the first record of breeding in the species for the peninsula.

Specimens (2): [Male], 40838, testis 11 x 7 mm., 66.9 gm. (August
14), and [Female], 40839, ovary 6 mm., 60 gm. (August 15), 4 km.
NNE Felipe Carrillo Puerto.

_Cassidix mexicanus_ (Gmelin): Boat-tailed Grackle.--Specimen (1): [Male], 40840, 223.3 gm. (July 9), 1 km. SW Puerto Real, Isla del Carmen.

_Dives dives dives_ (Deppe): Sumichrast Blackbird.--This species previously has been known to breed in May (Paynter, 1955a:263). The specimens from July had moderately active ovaries.

Specimens (2): [Female], 40842, ovary 8 x 4 mm., 92 gm. (July 11),
5 km. SW Champoton; [Female], 40841, ovary 11 x 5 mm., 88.6 gm.
(July 21), Piste.

_Icterus prosthemelas_ (Strickland): Black-cowled Oriole.--Specimens (2): [Female], 40843, ovary 5 x 3 mm., 28.8 gm., molting--extensive body molt, 1st, 2nd, and 3rd primaries ensheathed (August 3), 4 km. WSW Puerto Juarez; [Male], 40844, testis 2 x 1 mm., 31.0 gm., molting 1st, 2nd, 3rd, and 4th primaries ensheathed (August 16), 4 km. NNE Felipe Carrillo Puerto.

_Icterus mesomelas_ (Wagler): Yellow-tailed Oriole.--Our specimens extend the known breeding season; previous records are for April and May (Paynter, 1955a:265).

Specimens (4): [Male], 40848, testis 11 x 5 mm. (July 14), 7-1/2
km. W Escarcega; [Male], 40846, juv. (rectrices and remiges
ensheathed basally), 30.3 gm. (July 29), and [Male], 40847, testis
12 mm., 38.0 gm. (July 29), Pueblo Nuevo X-can; [Female], 40845,
ovary 6 x 3 mm., 32.5 gm. (August 4), 4 km. WSW Puerto Juarez.

_Icterus auratus_ Bonaparte: Orange Oriole.--Paynter (1955a:266) reported breeding specimens taken in April and May. Two males taken in late July had fully enlarged testes.

Specimens (2): [Male], 40849, testis 10 x 6 mm., 32.5 gm. (July
28), Pueblo Nuevo X-can; [Male], 40850, testis 11 x 7 mm., 33.0 gm.
(July 30), 1-1/2 km. S, 1 km. E Pueblo Nuevo X-can.

_Icterus gularis_ (Wagler): Black-throated Oriole.--Breeding in this species was reported by Paynter (1955a:267) only for the month of April. Breeding was apparently nearing an end in late July at Piste, where several juveniles were taken. Adult males had moderately enlarged testes.

Specimens (8): [Male], 40858, testis 5 x 3 mm., 67.2 gm. (July 20),
6-1/2 km. W Piste; [Male], 40853, 59.0 gm. (July 21), [Female],
40851, imm., 49.9 gm. (July 21), [Male], 40852, 56.4 gm. (July 21),
[Female], 40855, imm., 49.9 gm. (July 22), [Female], 40856, ovary
inactive, 50.0 gm. (July 22), [Male], 40854, testis 6 x 4 mm., 63.8
gm. (July 22), and [Male], 40857, juv. (all rectrices and remiges
ensheathed basally), 30.4 gm. (July 27), all from Piste.

_Icterus cucullatus_ Nelson: Hooded Oriole.--This species has not heretofore been recorded as breeding on Isla Cozumel; testes were nearly fully enlarged but probably regressing in the only specimen taken there. It had been banded (USF&WS no. 601-87003) on the island in 1961 as an adult. According to Paynter (1955a:269) there are no breeding records for this species on the mainland later than April, March 25 being the earliest date. The species was observed nesting on Isla del Carmen and adult males taken there and 5 km. S Champoton in early July were in full breeding condition.

Specimens (6): [Male], 40863, testis 11 x 7 mm., 26.3 gm. (July 8),
[Female], 40864, 31.4 gm. (July 8), and [Male], 40862, testis 11 x
5 mm., 24.7 gm. (July 8), 1 km. SW Puerto Real, Isla del Carmen;
[Male], 40860, 26.5 gm. (July 9), and [Male], 40861, testis 10 x 5
mm., 20.9 gm. (July 11); 5 km. S Champoton; [Male], 40859, testis 8
x 5 mm., molting--7th primaries ensheathed, 27.0 gm. (August 8),
3.5 km. N San Miguel, Isla Cozumel.

_Tanagra affinis affinis_ Lesson: Lesson Euphonia.--Specimens (2): [Female], 40866, 8.8 gm. (July 22), Piste; [Male], 40865, testis 3 x 2 mm., 10.0 gm. (August 3), 4 km. WSW (Aeropuerto) Puerto Juarez.

_Tanagra lauta lauta_ Bangs and Penard: Thick-billed Euphonia.--According to Paynter (1955a:272), the only breeding record previously available is that of a male having slightly enlarged testes on February 12. Males taken on July 15 and on August 14 had fully enlarged testes; the gonads of several other specimens were apparently regressing, two specimens had begun to molt, and juveniles were molting into first winter plumage.

Specimens (9): [Male], 40874, testis 7 x 4 mm. (July 15), and
[Female], 40875, ova to 1 mm. (July 15), 7-1/2 km. W Escarcega;
[Male], 40869, testis 6 x 4 mm., 14.5 gm. (August 14), [Male],
40870, testis 2 mm., 14.5 gm., molting--5th primaries ensheathed
(August 14), [Male], 40867, imm., 12.6 gm. (August 14), [Female],
40868, imm., 14.4 gm. (August 14), [Male], 40871, testis 2 mm.,
14.4 gm., molting--2nd, 3rd, and 4th primaries ensheathed (August
14), [Female], 40872, ovary granular, 7.8 gm. (August 14), and
[Female], 40873, ovary granular, 13.0 gm. (August 15), all taken 4
km. NNE Felipe Carrillo Puerto.

_Thraupis abbas_ (Deppe): Yellow-winged Tanager.--Paynter (1955a:273) reported breeding in this species in late April and late June. Gonads in our specimens were moderately active.

Specimens (2): [Male], 40877, testis 6 x 4 mm., 43.0 gm.,
molting--1st and 2nd primaries ensheathed (July 15), 1 km. N, 13
km. W Escarcega; [Female] 40876, ovary 7 x 4 mm., (ova to 1 mm.),
42.1 gm. (July 29), Pueblo Nuevo X-can.

_Spindalis zena benedicti_ Ridgway: Stripe-headed Tanager.--Two males in advanced molt but with enlarged gonads were taken on August 9 and 10 and seem to be the first records indicating breeding in this species on Isla Cozumel.

Specimens (3): [Male], 40878, testis 9 x 7 mm., 32 gm.,
molting--5th primaries and middle pair of rectrices ensheathed
(August 9), [Male], 40880, testis 5 x 3 mm., 30.0 gm.,
molting--3rd, 4th, 5th primaries and middle two pairs of restrices
ensheathed (August 10), and [Female], 40879, ovary inactive, 28.1
gm., molting--remiges are new; secondary coverts ensheathed (August
10), 3-1/2 km. N San Miguel, Isla Cozumel.

_Piranga roseogularis_ (Cabot): Rose-throated Tanager.--Breeding has been previously recorded from March 17 through May 11 (Paynter, 1955a:276). Our only specimen, a male in advanced molt, had enlarged (regressing) testes.

Specimen (1): [Male], 40881, testis 7 x 5 mm., 24.2 gm.,
molting--4th and 5th primaries ensheathed (August 15), 4 km. NNE
Felipe Carrillo Puerto.

_Habia gutturalis_ (Sclater): Red-throated Ant-tanager.--The only breeding records previously available for this species on the peninsula are for May 18 (Paynter, 1955a:280) and June 25 (Paynter, 1955b). Specimens taken between July 14 and August 2 were in full breeding condition. A male (40882) and female (40883) taken 7-1/2 km. W Escarcega were known to be mated. Plumages in all specimens are worn and for that reason specimens were not identified to subspecies.

Specimens (6): [Male], 40882, testis 14 x 9 mm., 38.9 gm. (July
14), [Female], 40883, ovary 5 x 5 mm., 29.0 gm. (July 14), and
[Male], 40887, testis 10 x 7 mm. (July 16), 7-1/2 km. W Escarcega;
[Male], 40885, juv. (rectrices and remiges ensheathed basally)
(July 28), and [Female], 40886, ovary moderately active, 30.5 gm.,
molting--2nd primaries ensheathed (July 28), Pueblo Nuevo X-can;
[Male], 40884, testis 15 x 8 mm. (August 2), 4 km. WSW Puerto
Juarez.

_Saltator atriceps_ (Lesson): Black-headed Saltator.--Previously, breeding has been noted in this species in February, March, and April (Paynter, 1955a:284). A male taken on July 16 was in full breeding condition.

Specimens (3): [Male], 40895, testis 15 x 9 mm., 80.4 gm. (July
16), and [Female], 40896, 73.5 gm. (July 17), 7-1/2 km. W
Escarcega; [Male], 40894, 71.6 gm. (July 29), Pueblo Nuevo X-can.

_Saltator coerulescens_ (Vieillot): Gray Saltator.--The only previous breeding record for this species is for April 26. Our one specimen, No. 40897, a juvenal male barely able to fly, taken on July 21 at Piste, weighed 43.8 grams.

_Richmondena cardinalis_ (Linnaeus): Cardinal.--The only record of breeding previously reported is of a male with enlarged testes taken on June 4 (Paynter, 1955a:287). Adult males with enlarged testes were obtained on July 11 and August 10, and three juveniles were taken southwest of Sisal on August 10, 16, and 18.

Specimens (7): [Male], 40903, testis 9 x 7 mm., 39.7 gm. (July 11),
and [Female], 40904, 34.0 gm. (July 11), 5 km. S Champoton; [Male],
40898, testis 7 x 4 mm., 33.8 gm. (August 10), and [Female], 40899,
juv. (rectrices and remiges ensheathed basally), 32.8 gm. (August
10), 13 km. WSW Sisal; [Male], 40900, fledgling, 18.4 gm. (August
18), 2 km. WSW Sisal; [Female], 40901, ovary granular, 37.4 gm.,
molting--1st primaries ensheathed (August 15), and [Male], 40902,
imm., 34.0 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.

_Cyanocompsa parellina_ (Bonaparte): Blue Bunting.--Specimens (2): [Male], 40906, imm. (July 15), and [Male], 40905, testis 10 x 7 mm., 15.2 mm. (July 15), 7-1/2 km. W Escarcega.

_Tiaris olivacea pusilla_ (Swainson): Yellow-faced Grassquit.--The only records of breeding, thus far, are by Paynter (1955a:291) for March 12 and June 14. A male (40907) taken 4 km. NNE Felipe Carrillo Puerto on August 14 had fully enlarged testes (8 x 5 mm.).

_Tiaris olivacea intermedia_ (Ridgway): Yellow-faced Grassquit.--Although females taken on Isla Cozumel exhibited no reproductive activity, two males had moderately enlarged testes. These seem to be the first records of breeding in this subspecies, which is endemic to Isla Cozumel.

Specimens (5): [Male], 40908, testis 6 z 4 mm., 10.5 gm. (August
8), [Female], 40912, ovary inactive, 9.5 gm. (August 8), [Female],
40909, ovary inactive, 10.4 gm. (August 9), [Male], 40910, testis 5
x 3 mm., 11.5 gm., molting--1st primaries ensheathed (August 9),
and [Male], 40911, 11.5 gm. (August 10), all from {2-1/2}-{3-1/2}
km. N San Miguel, Isla Cozumel.

_Sporophila torquiola morelleti_ (Bonaparte): White-collared Seedeater. --Breeding is known for this species in May and a male collected on September 2 was in breeding condition (Paynter, 1955a:293). Our records seem to be the first for the summer. Specimens taken in July and August were breeding.

Specimens (7): [Female], 40918, 9.2 gm. (July 8), 1 km. SW Puerto
Real, Isla del Carmen; [Male], 40919, testis 7 x 6 mm., 8.2 gm.
(July 15), 7-1/2 km. W Escarcega; [Female], 40913, ovary inactive,
7.9 gm. (August 4), 4 km. WSW Puerto Juarez; [Male], 40914, testis
minute, 7.8 gm. (August 14), [Female], 40915, ova to 6 mm. (August
15), [Female], 40917, ovary moderately active, 7.0 gm. (August 16),
and [Male], 40916, testis 7 x 5 mm., 7.6 gm. (August 16), 4 km. NNE
Felipe Carrillo Puerto.

_Volatinia jacarina splendens_ (Vieillot): Blue-black Grassquit.--The only previous record of breeding is a male having slightly enlarged testes taken on June 1 (Paynter, 1955a:293). Our specimens showed various stages of reproductive activity when taken on July 10.

Specimens (6): [Male], 40926, 8.9 gm. (July 10), and [Male], 40925,
testis 2 x 1 mm., 8.5 gm. (July 10), 1 km. S Puerto Real, Isla del
Carmen; [Male], 40924, testis 4 x 2 mm. (July 10), [Male], 40922,
testis 6 x 4 mm., 8.3 gm. (July 10), [Female], 40923, ova to 2 mm.,
10.3 gm. (July 10), and [Male], 40921, 8.2 gm. (July 10), 5 km. S
Champoton.

_Arremonops rufivirgata verticalis_ Ridgway: Olive Sparrow.--Apparently the only previous record of breeding was the laying female on June 14 reported by Paynter (1955a: 294). Males collected in July and August had enlarged testes; a juvenile, barely able to fly, was taken on August 14. Two specimens were beginning to molt.

Specimens (9): [Female], 40932, ova to 1 mm., 20.8 gm. (July 21),
and [Male], 40933, testis 8 x 6 mm., 21.2 gm. (July 21), Piste;
[Female], 40930, ovary moderately active, 23.2 gm. (July 26), and
[Male], 40931, imm., 22.7 gm. (July 26), 3-1/2 km. N Piste; [Male],
40934, testis 6 x 4 mm., 24.5 gm., molting--1st and 2nd primaries
ensheathed (August 14), [Male], 40935, juv. (remiges and rectrices
ensheathed basally), 17.7 gm. (August 14), [Female], 40936, imm.,
25.0 gm (August 14), [Female], 40937, ovary granular, 22.6 gm.,
molting--2nd primaries ensheathed (August 15), and [Male], 40938,
testis 7 x 5 mm. (August 15), 4 km. NNE Felipe Carrillo Puerto.

_Arremonops chloronota chloronota_ (Salvin): Green-backed Sparrow.-- Evidence presented by Monroe (1963) indicates that _A. chloronota_ and _A. conirostris_ are not conspecific. Specimens collected in breeding condition in July seem to be the first breeding records of this species on the peninsula.

Specimens (7): [Female], 40942, ova to 3 mm., 29.6 gm. (July 11), 5
km. S Champoton; [Male], 40944, testis 10 x 6 mm., 27.0 gm. (July
14), [Male], 40943, testis 5 x 3 mm., 23.1 gm. (July 14), and
[Male], 40945, testis 7 x 4 mm., 25.5 gm. (July 15), 5-{7-1/2} km.
W Escarcega; sex? 40939, 22.9 gm. (July 20), 6-1/2 km. W Piste;
[Male], 40940, imm., 21.5 gm. (August 4), 4 km. WSW Puerto Juarez;
[Female], 40941, 26.5 gm., extensive body molt, (August 15), 4 km.
NNE Felipe Carrillo Puerto.

TABLE 2. An Alphabetical List of Species of Mallophaga Removed from Birds Collected on the Yucatan Peninsula in 1962.

SUMMARY

Locality records are given for each of 136 species of birds represented by 493 specimens and sight records are given for eight additional species.

The Yellow-headed Vulture is reported apparently for the first time from the peninsula. The specimens of the Streak-headed Woodhewer and the Louisiana Waterthrush are the second ones of each species taken on the peninsula. The Purple Martin taken on August 14, the Barn Swallow on August 18, and the Louisiana Waterthrush on August 14 represent earliest known autumn dates for these transients.

Evidence for breeding is given for 20 species for the first time and extensions of the known breeding seasons are presented for 41 species.

Fourteen genera, representing about 19 species, of Mallophaga are reported for 20 different species of bird hosts.

At Piste and Puerto Juarez, species of birds such as the Blue Honeycreeper and the Red-capped Manakin, normally thought of as characteristic of more humid areas, were found breeding in numbers near _cenotes_. However, they were not seen to venture far into the surrounding deciduous forest. The availability of suitable habitat brought on by the rainy season and the regular occurrence of _cenotes_ helps to explain the presence of such species far outside the Rain Forest zone.

LITERATURE CITED

BLAKE, E. R.

1953. Birds of Mexico a guide for field identification. Univ. of Chicago Press, Chicago, xxix + 644 pp.

BRODKORB, P.

1943. Birds from the gulf lowlands of southern Mexico. Misc. Publ., Mus. Zool., Univ. Michigan., 55:1-88, January 30.

FRIEDMANN, H., GRISCOM, L., and MOORE, R. T.

1950. Distributional check-list of the birds of Mexico Part I. Pac. Coast Avif., 29:1-202, June 30.

JOHNSTON, R. F.

1962. The taxonomy of pigeons. Condor, 64:69-74, January 30.

LOWERY, G. H., JR. and BERRETT, D. G.

1963. A new Carolina Wren (Aves: Troglodytidae) from southern Mexico. Occas. Papers Mus. Zool., Louisiana St. Univ., 24:1-3, December 20.

MILLER, A. H., FRIEDMANN, H., GRISCOM, L., and MOORE, R. T.

1957. Distributional check-list of the birds of Mexico Part II. Pac. Coast Avif., 33:1-436, December 20.

MONROE, B. L., JR.

1963. Notes on the avian genus _Arremonops_ with description of a new subspecies from Honduras. Occas. Papers Mus. Zool., Louisiana St. Univ., 28:1-12.

PAYNTER, R. A., JR.

1955a. The ornithogeography of the Yucatan Peninsula. Bull. Peabody Mus. Nat. Hist., 9:1-347.

1955b. Additions to the ornithogeography of the Yucatan Peninsula. Postilla, no. 22, 4 pp. (unpaged).

RIDGWAY, R.

1914. Birds of North and Middle America: a descriptive catalogue ... Bull. U.S. Nat. Mus., 50:xx+1-882, 35 pls., April 8.

SELANDER, R. K. and GILLER, D. R.

1963. Species limits in the woodpecker genus _Centurus_ (Aves). Bull. Amer. Mus. of Nat. Hist., 124:215-273.

SKUTCH, A.

1947. Life history of the turquoise-browed motmot. Auk, 64:201-217, April.

STORER, R. W.

1961. Two collections of birds from Campeche, Mexico. Occas. Papers Mus. Zool., Univ. Michigan, 621:1-20, August 15.

TRAYLOR, M. A., JR.

1941. Birds from the Yucatan Peninsula. Publ. Field Mus. Nat. Hist., Zool. Ser., 24:195-225.

WEBSTER, J. D.

1963. A revision of the rose-throated becard. Condor, 65:383-399, 3 figs., 8 tables, September 27.

WETMORE, A.

1950. The identity of the American vulture described as _Cathartes burrovianus_ by Cassin. Jour. Wash. Acad. Sci., 40:415-417.

_Transmitted July 11, 1967._

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