{94}_Colobus ursinus_, Ogilby, P. Z. S., 1835, p. 98; Less. Spec. Mamm., p. 70 (1840); Martin, Mammif. Anim., p. 495 (1841); Fraser, Zool. Typ., pl. i. (1849); Is. Geoffr., Dict. H. N., iv., p. 208 (1849); Sclater, P. Z. S., 1860, p. 245; Reichenb. Naturg. Affen, p. 86 (1862); Schl., Mus. Pays-Bas, vii., p. 24 (1876). _Colobus personatus_, Temm., Mus. Lugd., _fide_ Reichenb. _t.c._, p. 88 (1862). _Colobus polycomus_, var., Gray, Cat. Monkeys Brit. Mus., p. 18 (1870); Rochebr., Faun. Sénég., Suppl. Mamm., p. 117, pl. viii. (1887), Matschie S.B. Ges. Natur. Fr. Berlin, 1892, p. 227. _Guereza ursinus_, Trouess., Consp. Mamm., p. 10 (1879). CHARACTERS.--Body large; fur long and glossy; face and ears naked and black; fur on neck, shoulders, and along the back forming a mantle; fur over the whole of the body and limbs deep black; front and back of head, auricular region, sides of the neck and throat, greyish-white, mingled with greyish-black; the tail long, short-haired, white at the extremity. YOUNG.--White, with a few scattered black hairs; tail well tufted. DISTRIBUTION.--West Africa: Sierra Leone. N. B.--Sinoe is the most easterly region whence skins come to the coast. HABITS.--This species is often found alone, not in large troops. It is more rare in collections than _C. ferrugineus_. VII. THE WHITE-THIGHED GUEREZA. COLOBUS VELLEROSUS. _Semnopithecus vellerosus_, Is. Geoffr. in Bélang. Voy. Mamm., p. 37 (1830). {95}_Semnopithecus bicolor_, Wesmael, Bull. Acad. Sc. Brux., ii., p. 236 (1835). _Colobus leucomeros_, Ogilby, P. Z. S., 1837, p. 69; Martin, Mammif. Anim., p. 497 (1841). _Colobus ursinus_, Temm., Esquiss. Zool. Guin., p. 21 (1853). _Colobus vellerosus_, Is. Geoffr., Dict. H. N., iv., p. 116 (1849); id., Cat. Méth. Primates, p. 17 (1851); Gervais, H. N. Mamm., i., p. 65 (1854); Sclater, P. Z. S., 1860, p. 246; Reichenb., Naturg. Affen, p. 87 (1862); Matschie, S.B. Ges. Natur. Fr. Berlin, 1892, p. 226. _Colobus bicolor_, Gray, P. Z. S., 1868, p. 181; id., Cat. Monkeys Brit. Mus., p. 18 (1870); Schlegel, Mus. Pays-Bas, vii., p. 26 (1876); Rochebr., Faun. Sénég., Mamm., p. 24 (1885). _Guereza vellerosus_, Truess. Consp. Mamm., p. 10 (1879). _Pterycolobus vellerosus_, Rochebr., _op. cit._, Suppl. Mamm., p. 125, pl. x. (1887). CHARACTERS.--Hair on the back, flanks, and loins, very long and silky; the fur everywhere deep black, excepting a frontal band, which coalesces with the long hair of the auricular region and sides of the neck, which are white, as well as the chin, the throat, a spot on each side of the buttocks, the external and posterior aspects of the thighs, and the short-haired tail, which is tufted at the tip; the thumbs very short, but distinct, and having a flat nail. Length of body, 28½ inches; of tail, 31 inches. The young are similar in coloration to the adults, but the hair is not elongated.