Cercopithecus diadematus, Geoffr. in Bélang., Voy. Zool. p. 51 (1834).
Cercopithecus leucampyx, Martin, Mamm. An., p. 529 (1841); Geoffr., Dict. Univ. Hist. Nat., iii., p. 304 (1849); Schl., Mus. Pays-Bas, vii., p. 83 (1876); Giglioli, Zool. Anz., x., p. 510 (1887); Sclater, P. Z. S., 1893, p. 253 (♀).
Cercopithecus pluto, Gray, P. Z. S., 1848, p. 56, pl. iii.; 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 23 (1870); Wagner in Schreb. Säugeth. Suppl., v., p. 48 (1855); Sclater, P. Z. S., 1870, p. 670, 1871, p. 36, 1892, p. 97.
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.
