CHARACTERS.--Body robust, covered with rather long hairs; face naked, blackish-blue, except the tip of the nose, corners of the mouth and edge of lower lips, which are flesh-colour; ears naked, blackish-blue; nose short and somewhat prominent; frontal hairs erect, directed forward, black; top and back of the head as far as the nape, black; back, sides, outer aspect of the thighs, base and upper surface of the tail, bluish or olive-black, with whitish hairs mingled on the shoulders and thighs; sides of the face from the middle of the cheek backwards to a point behind (enclosing the ears), neck, chin, and throat, the under surface of body, as well as the whole of the limbs (except the outer aspect of the thighs), and the under surface of the tail, rich rufous; tips of the fingers and toes black. Length of body, 29 inches; of tail, 31 inches. The hairs are all uniformly coloured. The thumb is often fairly well developed, and may have a nail. This species is extremely variable in the coloration of its fur; the back in some varieties is rufous, the cheeks and throat may be sandy-yellow or white, and the under side whitish or white, and the outside of the fore-limbs may be black, or agreeing in colour with the outside of the thighs. The well-developed _foetus_ shows no signs of the varied coloration of later life, but is quite white. DISTRIBUTION.--West Africa. Not uncommon along the whole West Coast. HABITS.--Like many of the other species of the genus, this species keeps to the tops of the highest trees of the forest. Its food consists of fruits and leaves. {93}V. THE BLACK GUEREZA. COLOBUS SATANAS. _Colobus satanas_, Waterhouse, P. Z. S., 1838, p. 58; Martin, Mammif. Anim., p. 497 (1841); Gervais, H. N. Mamm., p. 65 (1854); Sclater, P. Z. S., 1860, p. 246; Reichenb., Naturg. Affen, p. 88 (1862); Is. Geoffr., Dict. H. N., iv., p. 208 (1849); Gray, P. Z. S., 1868, p. 181; id., Cat. Monkeys Brit. Mus., p. 17 (1870); Schleg, Mus. Pays-Bas, vii., p. 27 (1876); Matschie, S.B. Ges. Natur. Fr. Berlin (1892), p. 226. _Semnopithecus anthracinus_, Leconte, Proc. Acad. Nat. Sci. Philad. 1857, p. 10. _Guereza satanas_, Truess. Consp. Mamm., p. 10 (1879). _Stachycolobus satanas_, Rochebr. Faun. Sénég. Suppl. Mamm., p. 114, pl. vii. (1887). CHARACTERS.--Fur very long, coarse; face naked, black; ears rounded, black; superciliary and frontal hairs very long; hairs of the cheeks long, very coarse, and directed backwards; fur entirely and uniformly black on the body and tail; hairs on tail short; tip not tufted. Length of body, 40 inches; of tail, 59½ inches. DISTRIBUTION.--West Africa. Forests of Senegambia, Sierra Leone, Gaboon, and the Congo. This is one of the commonest species in West Africa. VI. THE URSINE GUEREZA. COLOBUS URSINUS. _? Full-bottom Monkey_, Pennant, Quad., i., p. 197, pl. 24 (1781). _? Colobus polycomus_, Illig., Prodr., p. 69 (1811).