{ 58}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.
_Singe Verte_, Adanson, Voy. Sénég., p. 178 (1735).
_Cercopithecus sabæa_ (nec Linn.), Erxleb., Syst. Regne An., p. 33 (1777).
_Cercopithecus sabæus_, Wagner in Schreb. Säugeth., v., p. 40 (1855); Martin, Mammif. An., p. 519 (1841).
_Le Callitriche_, F. Cuv., Hist. Nat., Mamm., i., livr. iv. (Mars, 1819).
_Simia sabæa_, Audebert, Singes, Fam. iv., Sect., ii., p. 7, fig. iv. (1797).
_Cercopithecus callitrichus_, Is. Geoffr., Cat. Méth. Primates, p. 23 (1851); Schleg, Mus. Pays-Bas, vii., p. 73 (1876); Sclater, P. Z. S., 1866, p. 79; 1893, pp. 248, 616.
_Chlorocebus sabæus_, Gray, Cat. Monkeys Brit. Mus., p. 25 (1870).
{ 59}CHARACTERS.--Muzzle rather long; ears large, naked, and somewhat pointed behind; hairs on the side of the head long, thick, frill-like, and directed backwards toward the ears; hands and feet long, but the feet longer than the hands. Face, ears, palms, and soles, black; superciliary band bright yellow or white; head, back, shoulders, arms, and upper part of the forearms, the thighs, upper part of the legs, and upper side of the tail rich yellowish-green,--the hairs being ringed with broader bars of yellow, and narrower bars of black; external surface of the lower part of the fore- and hind-limbs grey, the hairs being ringed with white, or very pale yellow and black; cheeks, throat, under surface of the body, and inner side of the limbs, white, washed with yellow on the cheeks, throat, and along the mid-line of the belly. Tail tipped with a long tuft of bright yellow; under side of the tail greyish-green; hairs beneath the tail and on the scrotal region bright yellow; naked skin of the scrotal parts, green. Length of body, 24 inches; of tail, 29 inches.