_Cercopithecus martini_, Waterh., P. Z. S., 1838, p. 58; 1841, p. 71;
Martin, Mammif. Anim., p. 542 (1841); Gray, Cat. Monkeys Brit. Mus., p.
21 (1870); Scl., P. Z. S., 1884, p. 176, pl. xiv.; 1893, p. 245.
_Cercopithecus nictitans_, Schl., Mus. Pays-Bas, vii., p. 89 (1876).
DESCRIPTION.--Allied to _C. petaurista_. Fur tolerably long and but loosely
applied to the body. Face naked; whiskers bushy; beard short; tail very
long; callosities small. Length of body (type specimen), 22 inches; tail,
26. Length of a female, 19 inches; tail, 24. General colour of head, back,
and upper side of the basal part of the tail olive-green, distinctly
annulated, the hairs being grey at their base, ringed above with several
bars of yellowish-green and black. Face blue; nose-spot, commencing in the
middle of the ridge, and extending over its sides and the upper and lower
lips, yellowish-white; a black line extending up the ridge of the nose from
the end of the white spot to the brow and encircling the eyes; {48}a black
bar crossing the forehead from ear to ear; whiskers green; beard white;
throat, chest, under side of body, inside of limbs and under side of
three-fourths of the tail, greyish-white; fore-arms black; legs black; the
arms and thighs of the same colour as the back; upper side of the tail
beyond the basal region, and its terminal portion, black; hands and feet
black.
As Dr. Sclater has pointed out (_loc. cit._): "It is at once
distinguishable from _C. petaurista_ by the black fore-limbs and feet, by
the greenish colour on the tail above; the greenish cheeks, without any
white stripe beneath the ears, and the bluish skin of the face."
DISTRIBUTION.--Martin's Guenon is generally brought to Europe from the
island of Fernando Po, where it is probably indigenous. It may also inhabit
the neighbouring coast of Western Africa.