Characters.—Head more pyramidal than in C. cynosurus, and the muzzle thinner; an angular patch of hair at the corner of each eye, pointing backwards; whiskers forming long and thick ear-tufts, directed backwards and partly concealing the ears; ears small; hands short and small. Face, ears, and lips dark violet; region round the eyes livid flesh-colour; the superciliary band joining the whiskers white; top of the head, back as far as the rump, shoulders and arms greyish olive-green—the hairs ringed with greyish-black and pale yellow; whiskers, chin, breast, under surface of body, fore part of shoulders, the inner side of the limbs, and the under side of the tail, white; forearms, rump, and thighs grey, slightly washed with olive; hands and feet entirely grey; upper side of the tail greyish-black, the tip paler. Scrotal region coppery-green, covered with orange hairs.
Distinguished from the Malbrouck by the form of the head, the greyer shade of the hair, and the colour of the scrotal region; and from C. callitrichus, described below, by the more sombre colour of its hair, the white superciliary band, and the long white whiskers. Length of body, about 19 inches; tail, 22 inches.
Distribution.—North-east Africa: throughout Abyssinia, Sennaar, and Kordofan, up to 4,000 feet.
Habits.—According to Dr. Blanford, this species is a true tree Monkey, and is very rarely seen except in the forest. "On the highlands of Abyssinia," he says, "I only once saw a flock—this was near Dildi, south of Lake Ashangi. I met with larger flocks on the Anseba, where they inhabited the high trees on the banks of the stream. The flocks seen were small, not exceeding twenty to thirty individuals. I had but few opportunities of observing their habits, but they appeared to differ but little from those of Macacus or Inuus, except that Cercopithecus is a quieter animal and less mischievous. In captivity they are well known as excessively docile and good tempered, and fairly intelligent."
XV. WERNER'S GUENON. CERCOPITHECUS WERNERI.
Cercopithecus werneri, Geoffr., C. R., xxxi., p. 874 (1850); id., Arch. Mus., v., p. 539, pl. xxvii. (1851); Wagner, in Schreb. Säugeth. Suppl., v., p. 42 (1855); Sclater, P. Z. S., 1893, p. 258.
Characters.—Nearly related to C. sabæus, but all the parts are olive-green where that species is greyish-green—the hairs being ringed with reddish-fawn and black; the former taking the place of the green rings in the hairs of the C. sabæus, and the black ones being much broader; the face black; the tail yellow at the tip as in C. sabæus.
Distribution.—The exact habitat of this species is unknown.
XVI. THE GREEN GUENON. CERCOPITHECUS CALLITRICHUS.
(Plate XXVIII.)