This Monkey is very commonly to be seen alive in European {62}menageries, where it appears to stand the northern climate fairly well. At a meeting of the Zoological Society in November, 1893, Dr. Sclater remarked that _Cercopithecus callitrichus_ (= _C. pygerythrus_) had recently bred in the Gardens. Concerning the latter birth a curious fact had been observed and reported by the keepers--that the young Monkey, which lived about two months, had been in the habit of sucking both of the mother's teats at once. XVIII. THE TANTALUS GUENON. CERCOPITHECUS TANTALUS. _Cercopithecus tantalus_, Ogilby, P. Z. S., 1841, p. 33; Sclater, P. Z. S., 1893, p. 258; Schl., Mus. Pays-Bas, vii., p. 73 (1876). _Cercocebus tantalus_, var. f., Gray, Cat. Monkeys Brit. Mus., p. 26 (1870). CHARACTERS.--Head rounder and face shorter than in _C. callitrichus_. Face covered with very short hairs; nose prominent, and narrow between the eyes, flatter and broader towards the tip. Head, back, and sides, a mixture of yellowish-brown and green, of the same shade as prevails in the upper parts of _C. callitrichus_ and _C. pygerythrus_; outer surface of the limbs clearer ashy-grey; whiskers, throat, breast, under side of the body, and inner side of the limbs, yellowish-white; tail brown at the root, pale grey at the tip; back of hands and feet light grey; face livid flesh-colour round the eyes, the short hairs on the nose and cheeks black; lips light brown; eyebrows black, surmounted by a broad white band across the forehead; scrotal region covered with yellowish hairs. (_Ogilby._) DISTRIBUTION.--Africa, but the exact habitat is unknown. HABITS.--Unknown. {63}III. CERCOPITHECI ERYTHRONOTI. The next three species constitute the red-furred group of Geoffroy and Sclater, being bright rufous above, and white beneath. XIX. THE PATAS GUENON. CERCOPITHECUS PATAS. _Simia patas_, Schreber, Säugeth., i., p. 98, pl. xvi. (1775). _Cercopithecus patas_, Erxleb. Syst. Règne An., p. 34 (1777); Schleg., Mus. Pays-Bas, vii., p. 84 (1876); Scl., P. Z. S., 1893, p. 249. _Simia rubra_, Gm., Syst. Nat., i., p. 34 (1788); Fischer, Synops. Mamm., p. 24 (1829). _Cercopithecus ruber_, Geoffr., Ann. Mus., xix., p. 96 (1812); id., Dict. d'Hist. Nat., iii., p. 307 (1849); Desmar. Mamm., p. 59 (1820); Martin, Mammif. An., p. 509 (1841, pt.); Wagner, in Schreber, Säugeth. Suppl., v., p. 42 (1855); Scl., P. Z. S., 1874, p. 664. _Le Patas et Le Patas à bandeau noir_, F. Cuvier, Hist. Mamm. i., livr. xv. (Avril, 1820). _Chlorocebus ruber_, Gray, Cat. Monkeys Brit. Mus., p. 25 (1870).