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).
Characters.—Similar to C. grayi, but differs in the yellow forehead being interrupted in the middle by only a few black hairs, and not by a streak; the whiskers paler; the back part of the head, the fore part of the back, and the sides grizzled, the hairs being black, ringed with white; while down the middle of the back to the base of the tail runs a broad black stripe.
Distribution.—Fernando Po.
XXXV. THE BLACK-FOOTED GUENON. CERCOPITHECUS NIGRIPES.
Cercopithecus nigripes, Du Chaillu, Pr. Bost. N. H. Soc., vii., p. 360 (1860); Gray, P. Z. S., 1868, p. 182; Scl., P. Z. S., 1893, p. 254.
Cercopithecus erxlebenii, var. nigripes, Gray, Cat. Monkeys Brit. Mus., p. 23 (1870).
Cercopithecus pogonias, Schlegel, Mus. Pays-Bas, vii., p. 182 (1876).
Characters.—Very similar to C. pogonias, but differs in being darker, and in having the dorsal stripe wider and more diffused lower down. It is probably only a variety of the preceding.
Distribution.—Gaboon, where it was discovered by Du Chaillu.
XXXVI. WOLF'S GUENON. CERCOPITHECUS WOLFI.