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).
Semnopithecus bicolor, Wesmael, Bull. Acad. Sc. Brux., ii., p. 236 (1835).