Chapter IV: The Grey-Cheeked Mangabey. Cercocebus Albigena

_Presbytis albigena_, Gray, P. Z. S., 1850, p. 77, pl. xvi; Murie, P. Z.
S., 1865, p. 740.

_Cercocebus albigena_, Pucher., Rev. Zool., 1857, p. 241; Schl., Mus.
Pays-Bas, vii., p. 97 (1876).

_Cercocebus_ (_Semnocebus_) _albigena_, Gray, Cat. Monkeys Brit. Mus., p.
27 (1870).

CHARACTERS.--Face nude, except for a few short hairs on the cheeks and lips; a tuft of long stiff hairs projecting over each eye; hair of the body elongated on the fore-quarter and arm; on the crown and nape the hair long and directed backwards, forming a crest; hands and feet short, tail long, thumb small, and great-toe large and broad; face black.

General colour of the body black; cheeks, throat, a spot behind the ear, sides of the neck, shoulder, and front of the chest greyish; hairs on the face and over the eyes black; tail black; callosities black.

A younger specimen, which died in 1865 in the Zoological Gardens in London, had the throat, sides of the neck and front of the chest, dirty-brown; hairs of the cheeks of the same colour, and some of them also black.

DISTRIBUTION.--West Africa.

V. THE BLACK MANGABEY. CERCOCEBUS ATERRIMUS.

_Cercopithecus aterrimus_, Oudem. Zool. Gart., xxxi., p. 267 (1890).

_Cercocebus aterrimus_, Scl., P. Z. S., 1893, p. 256 (note).

{41}CHARACTERS.--Closely allied to _C. albigena_, but distinguished by its generally deep black colour, except on the shoulders and nape, which are blackish-brown or brownish-grey--the hair here being no longer than on the rest of the body; hairs on the cheeks, fine, velvety, and whitish; whiskers thick, greyish-brown; beard very sparse, whitish.

DISTRIBUTION.--South-west Africa: Stanley Falls on the Congo.

HABITS.--Unknown.