CHARACTERS.--Face, nose, and lips black; whiskers rounded and bushy; no beard; fur long and harsh; form robust and powerful; whiskers grizzled, the hairs ringed with black and white; across the forehead, over the eyes, a broad white bar (or diadem); the back beyond the shoulders, the sides and haunches, and the posterior aspect of the thighs, grizzly-grey, the hairs ringed with numerous greenish-white and black bars; tail grey at its base, rest black; a few yellowish hairs on the callosities, but all the rest of the body deep black. Length of body, 23 inches; of tail, 21. DISTRIBUTION.--West Africa: Angola, and the Congo, to Nyasa Land. HABITS.--Unknown. V. CERCOPITHECI AURICULATI. The following three species form the fifth group of the Guenons, distinguished by their yellowish or rufous ear-tufts, and the three black lines over the forehead. PLATE XXX. [Illustration: ERXLEBEN'S GUENON.] {77}XXXIII. ERXLEBEN'S GUENON. CERCOPITHECUS GRAYI. _Cercopithecus grayi_, Fraser, Cat. Knowsl. Coll., p. 8 (1850); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 22 (1870); Sclater, P. Z. S., 1893, p. 256. _Cercopithecus erxlebenii_, Dahlb. et Puch., Rev. et Mag. de Zool., 1856, p. 96; 1857, p. 196; Dahlb., Zool. Stud., p. 109, pl. 5 (1856); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 23 (1870; in part); Sclater, P. Z. S., 1871, p. 36; 1893, p. 254; 1894, p. 484. _Cercopithecus pogonias_, Schlegel, Mus. Pays-Bas, vii., p. 82 (part). (_Plate XXX._) CHARACTERS.--Face and ears naked, flesh-coloured; whiskers commencing under the eyes, bushy, yellow; the ears with a rufous or yellow tuft internally; head yellow, but interrupted by three broad black streaks, extending from above each eye and from the nose to the back of the head; back, anterior aspect of the thighs, and the sides yellowish rufous, darker towards the lower back--the hairs ringed with black and yellow, upper surface and entire terminal third of the tail black. Under surface of the body, inner side of the limbs, anterior aspect of the thighs and legs, and the under side of the basal two-thirds of the tail, yellow or rufous yellow; region of the anus white; external aspect of the fore-limbs black; the hands and feet black. A female specimen of this species which lived for some years in the menagerie of Lord Derby at Knowsley, and died in 1836, is now in the Derby Museum, Liverpool. It is the type of _C. grayi_, with which _C. erxlebeni_ is identical. DISTRIBUTION.--West Africa: River Congo. {78}XXXIV. THE BEARDED GUENON. CERCOPITHECUS POGONIAS. _Cercopithecus pogonias_, Bennett, P. Z. S., 1833, p. 67; Wagner in Schreber Säugeth. Suppl., v., p. 43 (1855); Lesson, Spec. Mamm., p. 74 (1840); Martin, Mammif. An., p. 543 (1841); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 23 (1870); Sclater, P. Z. S., 1893, p. 254; Schlegel, Mus. Pays-Bas, vii., p. 82 (1876).