_Simia petaurista_, Schreb., Saügeth., i., p. 103, pl. xix. B (1775). _Blanc-nez_, Buff., Hist. Nat., Suppl., vii., p. 67 (1789). _Cercopithecus petaurista_, Erxl., Syst. Regn. An., p. 35 (1777); Martin, Mammif. An., p. 539 (1841); Wagn. in Schreber's Säugeth., Suppl., v., p. 250 (1855); Gray, Cat. Monkeys Brit. Mus., p. 20 (1870); Schleg., Mus. Pays-Bas, vii., p. 86 (1876); Scl., P. Z. S., 1893, p. 244. _Ascagne_ (_Cercopithecus ascanius_), Audeb., Hist. Nat. Singes, Fam. iv., Sect. ii., fig. xiii.; F. Cuvier, Nat. Hist., Mamm., i., livr. xiv. (Fev., 1820). CHARACTERS.--Head round, the forehead rather elevated; nose broad; face and nose covered with short hairs; whiskers short; chin bearded. Head, back, upper side of tail, olive-green--the hairs grey at the base--ringed with darker or lighter yellow and black; facial hairs black, slightly washed with fulvous on the cheeks; skin below bluish-red or violet; lower part of the nose and half of the upper lip white; whiskers and beard white; line across the forehead above the eyes and the ears, and {45}encircling the crown behind, black; a pencil of hair below the ears directed backward, white; throat, chest, under side of body, inside of limbs and under side of tail white; posterior aspect of fore-arms and legs grey, washed with olive; naked parts of chin, ears, and hands purplish-black. DISTRIBUTION.--West Africa: Gold Coast and Sierra Leone. HABITS.--The Ascagne, as this animal is also named, is the most common of the Guenons seen in menageries. It is gentle, graceful, and lively. They are perpetually in motion, "gambolling with their companions, and pursuing or being pursued by them, in the exuberance of playfulness. They are at the same time docile and familiar, but dislike to be taken hold of, or interfered with." (_Martin._) Allamand says that his specimen, which was in general very gentle, became angry when interrupted while eating, or if it was gibed at, but its irritation did not last long. II. JENTINK'S GUENON. CERCOPITHECUS SIGNATUS. _Cercopithecus signatus_, Jentink, Notes, Leyd. Mus., viii., p. 55 (1886); Sclater, P. Z. S., 1893, p. 257. CHARACTERS.--Very similar to _C. petaurista_. Sides of head grizzled--the hairs ringed with white, yellowish, and black--and separated abruptly from the reddish upper portion of the head by a black band from ear to ear over the orbits, but not running round the vertex; ears somewhat larger than in _C. petaurista_. Cranial portion of skull higher, and the facial portion more produced than in _C. petaurista_; the jaws longer, and the orbits rounder and wider. DISTRIBUTION.--Supposed to be from West Africa, but its habitat is not known with certainty. {46}III. THE RED-BELLIED GUENON. CERCOPITHECUS ERYTHROGASTER.