_Cercopithecus samango_, Sundev. Öfvers. K. Vet.-Akad. Förh. Stockh., i., p. 160 (1844); Wagner in Schreber Säugeth. Suppl., v., p. 44 (1855); Peters, Reis. Mossamb., Säugeth., p. 4; Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 24 (1870); Schleg., Mus. Pays-Bas, vii., p. 79 (1876; in part); Scl., P. Z. S., 1893, p. 251. CHARACTERS.--Distinguished by the dirty white tint along the basal half of the tail, except along the median line of the upper side, which is black; end of the tail black. Back entirely blackish-olive--the hairs being yellowish-olive, ringed with black; inner side of the limbs, and entire under surface from the arms to the chin, dirty white; outer surface of the arms black, of the legs grey; the feet black; ears covered with whitish hairs. DISTRIBUTION,--South and East Africa: Natal and Mozambique; extending to Angola in the west. {72}XXVII. THE WHITE-LIPPED GUENON. CERCOPITHECUS LABIATUS. _Cercopithecus labiatus_, Geoffr., C. R., xv., p. 1038 (1842); id., Dict. d'Hist. Nat., iii., p. 302 (1849); Sclater, P. Z. S., 1893, p. 256. _Cercopithecus samango_, Schl., Mus. Pays-Bas, vii., p. 79 (1876; in part). CHARACTERS.--Fur thick; a bunch of long hairs directed backwards on the cheeks; inner aspect of the ears covered with reddish-grey hairs; upper side of the body dark grey, speckled with pale olive-yellow; top of the head black, speckled with yellowish-green; forehead and jaws greenish-yellow, speckled with black; a black spot on the face above the commissure of the lips; rest of the lips and region of the mouth white; outer side of the fore-limbs, hands, and feet black; outer side of the hind-limbs greyish-brown; under side of the body faded white; inner side of the limbs ashy-grey; round the anus and the greater part of the under side of the tail, pale yellowish-brown; upper side of the tail, for same distance, reddish-black; remainder black. DISTRIBUTION AND HABITS.--Unknown. XXVIII. THE RUMP-SPOTTED GUENON. CERCOPITHECUS OPISTHOSTICTUS. _Cercopithecus opisthostictus_, Scl., P. Z. S., 1893, p. 725. CHARACTERS.--Back black, speckled with pale grey; head darker; back of the neck, shoulders, external aspect of the hands and feet, and the tail (except at its base), black; a small spot on the lower back on each side of the tail rufous; under side blackish. Length of body, 24 inches; of tail, 25 inches. (_Sclater._) {73}DISTRIBUTION.--British Central Africa: near Lake Mweru. HABITS.--Unknown. The skin of this Monkey is used by the natives to form dresses, and from specimens of these, collected by Mr. A. Sharpe, H.B.M. Vice-Consul in Southern Nyasa Land, during his journey from the north end of Lake Nyasa to Lake Mweru and the Luapula, this species has been described by Dr. P. L. Sclater. XXIX. STAIRS' GUENON. CERCOPITHECUS STAIRSI. _Cercopithecus stairsi_, Sclater, P. Z. S., 1892, p. 580, pl. xl.; 1893, pp. 252, 443, and 612.