_Cercopithecus melanogenys_, Gray, Ann. and Mag. Nat. Hist., xvi., p. 212
(1845); id., P. Z. S., 1849, p. 7, pl. ix., fig. 2; id., P. Z. S., 1868,
p. 182; id., Cat. Monkeys Brit. Mus., p. 21 (1870); Scl., P. Z. S., 1860,
p. 246; Monteiro, P. Z. S., 1860, p. 112; Jentink, Notes, Leyden Mus.,
x., p. 11 (1888); Sclater, P. Z. S., 1893, p. 245.
_Cercopithecus picturatus_, Santos, Journ. Sci. Lisb., xi., p. 98 (1886).
CHARACTERS.--The white nose-spot cordate in shape; a band across the
forehead above the eyes passing backwards over the ears, and over the lower
cheeks, black; region between the eye and the ear whitish; back finely
grizzled with black and orange; centre of the back washed with deep rufous;
outside of the legs dark grey, becoming black on the hands and feet; tail
dark rufous. Length of body, 15¾ inches; tail, about 17 inches.
The black lower cheeks, and the white region between the eye and the ear
distinguish _C. melanogenys_ from _C. nictitans_ and _C. stampflii_.
DISTRIBUTION.--West Africa: Angola. "It is very abundant at Encôge, three
days' journey to the south of Bemba." (_Monteiro._)
{50}VIII. STAMPFLI'S GUENON. CERCOPITHECUS STAMPFLII.
_Cercopithecus melanogenys_, Schl., Mus. Pays-Bas, vii., p. 90 (1876, nec
Gray).
_Cercopithecus stampflii_, Jentink, Notes, Leyden Mus., x., p. 10 (1888);
Sclater, P. Z. S., 1893, p. 257.
CHARACTERS.--Nose-spot white, with its broader part lowest, and the point
upwards; crown of head, nape of neck, legs and hinder portion of tail
black; spot on lower lip black; chin, breast, anterior portion of belly,
and inside of fore-arms white; forehead, cheeks, back, sides of body, and
the basal portion of the tail, rufous-green, the hairs being ringed with
black and rufous-yellow. Length of body, 25¼ inches; tail, 38½ inches.
Distinguished from _C. nictitans_ by its white under surface.
DISTRIBUTION.--West Africa: Liberia. Obtained in the Pessi country by
Messrs. Büttikofer and Stampfli.