_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.