HABITS.--These hideous and extraordinary animals live together in large companies, and are a terror to the natives. They are less ill-dispositioned when young, but when adult, they are very savage. They are nearly omnivorous, but fruits and insects form their chief food. When the Mandrill is in any way excited, the brilliantly-coloured naked parts of the skin are said to become still more vividly coloured. II. THE DRILL. PAPIO LEUCOPHÆUS. _Simia leucophæa_, F. Cuvier, Ann. Mus., ix., p. 477, pl. 37 (1807); id. Hist. Nat. Mamm., livr. iv., p. 637 (1807). _Papio leucophæa_, Gray, List Mamm., Brit. Mus., p. 10 (1843). _Chæropithecus leucophæus_, Gray, Cat. Mamm., Brit. Mus., p. 35 (1870). _Papio leucophæus_, Schl., Mus. Pays Bas, vii., p. 131 (1876). (_Plate XXII._) PLATE XXII. [Illustration: THE DRILL.] {261}CHARACTERS.--Somewhat similar to _C. maimon_, but body less robust, the limbs more slender. Face-swellings with only two furrows; crest and mane less prominent; whiskers encroaching on the face less than in the Mandrill; beard slightly shorter; ears naked, pointed; tail very short, erect, covered with hair all round; the hair round the head, shoulders and sides of body, in a band below the chin, on the under surface of the body, and the outer surface of the limbs, long and fine; muzzle long and truncated, the nostrils placed at its extremity, and somewhat tubular; fingers and toes naked. Face entirely black, without bright coloration; general colour of fur brown, approaching that of the Mandrill, but washed with greenish on the upper parts, and the shoulders darker. The hairs on the top of the head, on the back, and wherever the greenish colour appears, are grey at the base, alternating with black and yellow, thus producing the greenish coloration; a band from the throat to behind the ear greyish; the whole of the under surface and inner side of the limbs greyish-white; beard and whiskers greyish-white, washed with greenish; hands and feet reddish-purple; callosities bright scarlet. YOUNG MALE.--Smaller; face-swellings less marked; fur and beard more washed with greenish; neck-band paler grey; whiskers paler; callosities not scarlet. FEMALE.--Like the young male, but the head shorter, and the callosities scarlet; the head and shoulders less haired; the grey neck-band absent; fur in general paler; the greenish hue less marked except on the head and limbs; the fur predominating on the lower part of the back and flanks. DISTRIBUTION.--The Drill is confined to West Africa. HABITS.--Little is known of the habits of the Drill. It has {262}the reputation of being good-tempered when young, and of being, when old, ferocious, like the Mandrill. III. THE DOGUERA BABOON. PAPIO DOGUERA. _Cynocephalus babouin_, Rüpp., Neue Wirb. Säugeth., i., p. 7 (1835, in part). _Cynocephalus doguera_, Pucher. et Schimp., Rev. et Mag. de Zool., 1856, p. 96, 1857, p. 57.