VI. THE LUDIO GUENON. CERCOPITHECUS LUDIO.
Cercopithecus ludio, Gray, P. Z. S., 1849, p. 8, pl. ix., fig. 1; id., P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 21 (1870), Wagner, in Schreb., Säugeth. Suppl., v., p. 51 (1855); Sclater, P. Z. S., 1893, p. 245.
Cercopithecus ascanias, Schl., Mus. Pays-Bas, vii., p. 87 (1876).
Characters.—Spot on lower half of nose large, oblong, higher than broad. General colour of fur black or dark greenish-olive, minutely speckled with greyish-yellow. Face and lips blackish-blue, the nose-spot white; ridge of nose above the white spot, superciliary band, crown of head, shoulders and fore-limbs, black; outer and inner aspects of hind-limbs and extremity of tail black; chin, chest, inner side of the upper part of the arms, and under side of body, whitish; whiskers black; rump and under side of the base of the tail rufous.
Distinguished from C. petaurista by its black limbs, reddish rump and base of tail.
Distribution.—West Africa: Cameroons and the Delta of the Niger.
VII. THE BLACK-CHEEKED GUENON. CERCOPITHECUS MELANOGENYS.
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.