Cercopithecus schmidti, Matschie, Zool. Anz., p. 161 (1892); Sclater, P. Z. S., 1893, p. 245, pl. xvi.
Characters.—Closely allied to C. melanogenys, the white nose-spot cordate. Face and superciliary region blue; nose above the white spot black; a bar between the nose-spot, reaching to the whiskers, on each side, black; upper and lower lips flesh-coloured; whiskers white, conspicuous, and with a very narrow black streak on their lower edge; beard white; above the superciliary region, and between the flesh-coloured ears, a black frontal bar; top of head, back, outer aspect of arms, thighs, and of the basal third of tail, olive-green and more punctulated than in C. melanogenys; throat, under side of body, and inner side of the upper part of the limbs, white; fore-arms, hands, legs, and feet black; posterior two-thirds of tail rufous.
Distribution.—This species was obtained by the Rev. W. C. Willoughby, in 1883, at Uniamwezi, in Eastern Equatorial Africa, and was said to have been brought thither from the Manyuema country, on the western shore of Lake Tanganyika. His specimen lived in the Zoological Gardens in London for nearly three years. It has also been obtained in Uganda, further to the north.
X. THE HOCHEUR GUENON. CERCOPITHECUS NICTITANS.
Simia nictitans, Linn., Syst. Nat., i., p. 40 (1766).
Cercopithecus nictitans, Erxl., Syst. Règne Anim., p. 35 (1777); Martin, Mammif. An., p. 536 (1841); Wagner, in Schreber's Säugeth. Suppl., v., p. 50 (1855); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 21 (1870); Schl., Mus. Pays-Bas, vii., p. 89 (1876); Scl., P. Z. S., 1893, p. 246.
Cercopithecus nictitans (Hocheur), F. Cuvier, Hist. Nat., Mamm. i., pl. 17 (1825); Audebert, Hist. Nat. des Singes, Fam. iv., Sect. i., p. 9, pl. 2.
Characters.—Head round; forehead elevated; face depressed; nose broad, short-haired. "Hair of the head very full; boldly over-reaching the eyes, obscuring the ears, and adding to the breadth and elevation of the top of the head." (Martin.) Nose-spot narrow above, commencing between the eyes, broad below; the lips and a broad ring round the eyes, nude, or very short-haired, elsewhere haired; whiskers bushy; callosities covered with hair; thumbs very short; muzzle shorter than is usually the case in the genus; no beard; tail long, thinly-haired, tapering.
General colour all over, black, speckled with white or yellowish, the hairs being grey at their roots, then black, tipped with white or yellowish-white; face purplish-black; nose-spot pure white; no white on the lips; ears black; no black stripes on the face, a character distinguishing it from all the other spotted-nosed Monkeys; under surface of body and basal part of tail blackish-grey, the inside of the limbs less distinctly so.
Some specimens are not so black, but are greyer, especially on the under side, which may be washed with brown.