CHARACTERS.--Head broad, and rounded above; muzzle thick. Face naked, flesh-coloured; nose and cheeks black-haired; ears nude, black; hands short, thumbs rudimentary; hairs on the side of the head not forming whiskers. Top of head and upper surface of body olive-green--the hairs being grey at their roots and ringed with black and yellow; external surface of the fore-arms and legs grizzled-grey, the hairs with black and white rings; sides of the neck, under surface of the body, inside of the limbs, and the under side of the tail white; an indistinct band across the forehead over the eyes, white; tail dark grey above; callosities scarlet; scrotal region in the male deep blue; hairs beneath the tail and round the scrotal region rufous. Length of body about 18 inches; tail, 16 inches. DISTRIBUTION.--West Africa. Probably Senegambia, but the exact habitat still unknown. HABITS.--Of the habits of the Malbrouck in its own home nothing has been recorded; but Mr. Martin remarks that in captivity it combines in its disposition a certain degree of {56}sluggishness with a savage and vindictive temper. One of the specimens, he says, "in the menagerie of the Zoological Society, an adult male, was gentle, familiar, and pleased to be noticed or caressed; but, at the same time, it was neither lively nor playful. The other was deceitful, and though apparently calm, very suspicious; it was roused by the slightest provocation to anger, and would turn upon its disturber with the utmost malevolence depicted in its countenance, making every possible effort to assault him, exhibiting its teeth and gazing fixedly in his face.... On the whole, indolence and ferocity form the character of the adult, at least, in captivity." XIV. THE GRIVET GUENON. CERCOPITHECUS SABÆUS. _Simia sabæa_, Linn., Syst. Nat., i., p. 38 (1766). _Cercopithecus griseus_ (Le Grivet), F. Cuvier, Mamm., i., livr. vii. (Juin, 1819). _Cercopithecus griseo-viridis_, Desmarest, Mamm., p. 61 (1820); Martin, Mammif. An., p. 518 (1841); Rüppell, Neue Wirbelth. Säugeth., p. 8 (1835); Blanford, Zool. Abyss. Exp., p. 224 (1870); Sclater, P. Z. S., 1893, p. 248. _Cercopithecus sabæus_, Geoffr., Cat. Méth. Primates, p. 22 (1851); Schleg., Mus. Pays-Bas, vii., p. 74 (1876). _Chlorocebus engythithea_, Gray, Cat. Monkeys Brit. Mus., p. 26 (1870).