Chapter II: The Black-Headed Squirrel-Monkey. Chrysothrix Entomophaga

_Callithrix entomophagus_, d'Orb., Voy. Amér. Mér., iv., Mamm. pl. 4
(1836).

_Callithrix boliviensis_, d'Orb., Nouv. Ann. Mus., iii., p. 89 (1834).

_Saimiris entomophagus_, d'Orb., Voy. Amér. Mér., iv., Mamm., text, p. 10
(1847); Is. Geoffr., Cat. Méth. Primates, p. 38 (1851).

_Saimiri entomophagus_, Schl., Mus. Pays Bas, vii., p. 246 (1876).

_Chrysothrix sciurea_ (nec L.), Frantz. in Wiegm. Arch. f. Nat., xxxix.,
p. 260 (1869).

_Chrysothrix entomophagus_, Wagn., Ann. Nat. Hist., xii., p. 42 (1843);
Gray, Cat. Monkeys Brit. Mus., p. 53 (1870).

CHARACTERS.--Face grey, washed with yellow; ears haired; head black; hairs of back black, with long yellow tips, or yellow with black tips, producing a shade of brown washed with golden; outer side of upper part of arms and legs yellow, peppered with black; throat, under surface of body and inside of limbs yellowish-grey; tail long, black.

{156}In some species the upper part of the head has a shade of yellow, caused by the colour of the lower half of the hairs showing through the black tips.

DISTRIBUTION.--Bolivia; Veragua, Central America; and the warmer regions of Costa Rica, where it inhabits the humid forests.