Cercopithecus wolfi, Meyer, Notes, Leyden Mus., xiii., p. 63 (1891); id., P. Z. S., 1894, p. 83, pl. vii.; Sclater, P. Z. S, 1893, p. 258.
Characters.—Face, except the lips, which are flesh-colour, and the temples, greyish-black; a yellowish-white bar across the forehead from ear to ear; whiskers greyish-yellow; ear-tufts reddish-brown; upper surface dark slate-grey; sides blue-grey, the hairs barred with several pale rings, and tipped with black; dorsal stripe, narrowing towards the tail, olive-yellowish, brighter on the crown, and brownish-yellow towards the tail; basal half of the tail above, ashy-grey, below white; an orange-yellow patch on the sides; chin, sides of neck, under surface of body and inner side of limbs white; belly washed slightly with orange; shoulders and outer aspect of the fore-limb, black—the hairs ringed with grey; on the hinder edge of the fore-arms an ochre-coloured stripe; outer side of thighs and legs bright red-brown, becoming orange on their anterior and posterior internal margin. Length of body, 18¼ inches; of tail, 24 inches.
Distribution.—West Africa: the exact locality is unknown.
VI. Cercopitheci Barbati.
The members of this group are distinguished by possessing a beard and a frontal crest.
XXXVII. THE DIANA GUENON. CERCOPITHECUS DIANA.
Simia diana, Linn., Syst. Nat., i., p. 38 (1766).
Cercopithecus diana, Erxleb., Syst. Regne An., p. 30 (1777); Desmar., Mamm., p. 60 (1820); Martin, Mammif. An., p. 523 (1841); Geoffr., Dict. Hist. Nat., iii., p. 304 (1849); Wagner in Schreb. Säugeth. Suppl., v., p. 48 (1855); Gray, Cat. Monkeys Brit. Mus., p. 22 (1870; pt.); Schl., Mus. Pays-Bas, vii., p. 92 (1876; pt.); Jentink, Notes, Leyd. Mus., x., p. 12; Sclater, P. Z. S., 1893, p. 254.
Cercopithecus diana, var. ignita, Gray, Cat. Monkeys Brit. Mus., p. 22 (1870).
Characters.—Face black. Sides of face with long bushy whiskers, terminating on the chin in a pointed white beard a few inches long; across the forehead run two arched lines of erect hairs, the lower black, the upper white; top of the head, back of the neck, shoulders, the sides, middle of belly, ashy-grey—the hairs being white and black ringed, and white-tipped; outside of limbs darker, the hands black; tail grey, the tip black; neck, chest, and anterior part of the arms white; from the middle of the back a deep chestnut spot extends, and widens to the root of the tail; from the base of the tail, the outer aspect of the thighs, white; posterior part of under side of body and inner side of thighs, orange-yellow, or orange red, or bright red bay (C. ignita of Gray). Length of body, 18 inches; of tail, 24 inches.