_Semnopithecus nigripes_, A. Milne-Edwards, Nouv. Arch. Mus. vi., p. 7 (1871); Schl., Mus. Pays-Bas, vii., p. 32 (1876); Anderson, Zool. Res. Exped. Yun-nan, p. 4 (1878). CHARACTERS.--Similar to _S. nemæus_, but differing in having the posterior limbs black, and the fore-arms grizzled, instead of white. The whiskers are short and black, the body more slender, longer, and entirely white. The hind-limbs are also more elongated. Both sexes are alike; and the young differ little from the adults. The brain-case is depressed, the face short, and the inter-orbital swelling peculiar to so many of the crested _Semnopitheci_, is wanting. DISTRIBUTION.--Saigon in Cochin-China, and the forests bordering the Mekong river towards its mouth. {136}XXVII. THE BLACK-CRESTED LANGUR. SEMNOPITHECUS MELANOLOPHUS. _Simia melalophus_, Raffles, Tr. Linn. Soc., xiii., p. 244 (1821). _Semnopithecus melalophus_ (Le Cimepaye), F. Cuv., Hist. Nat., Mammif., livr. xxx. (July, 1821); Raffles, Tr. Linn. Soc., xxii., p. 245 (1822); Desmar., Dict. Sc. Nat., xlviii., p. 38 (1827); Martin, Mammif. Anim., p. 470 (1841); Geoffr., Cat. Méth. Primates, p. 16 (1851); Gray, Cat. Monkeys Brit. Mus., p. 16 (1870); Schl., Mus. Pays-Bas, vii., p. 43 (1876; in part); Anders., Zool. Res. Exped. Yun-nan, p. 34 (with full synonymy; 1878). _Semnopithecus flavimanus_, Lesson, Cent. Zool., p. 109, pl. xl. (1830); Is. Geoffr., Cat. Méth. Primates, p. 16 (1851). _Semnopithecus sumatranus_, var. _auratus_ (nec Geoffr.), Müller and Schl. Verhandl., pl. x. _bis_, fig. 2 (1839-44). _Presbytes melanophus_, Gray, Hand. List Mamm. Brit. Mus., p. 2 (1843). _Presbytes flavimana_, Gray, _t.c._, p. 2 (1843). _Semnopithecus nobilis_, Gervais, Hist. Nat., Mammif., p. 63 (1854); Gray, Cat. Monkeys Brit. Mus., p. 17 (1870). _Semnopithecus ferrugineus_, Schl., Mus. Pays-Bas, vii., p. 42 (1876). CHARACTERS.--Head crested; the crest dark-brown, tipped with dusky; forehead pale yellow; a line from the outer corner of the eye to the ear, dark brown; back, sides, and shoulders reddish, washed with pale brown; the rest of the fore-limbs, the whole of the hind-limbs, and the tail, orange-red. Length of body, 18 inches; of tail, 32 inches. The golden variety (_S. auritus_) from Sumatra, is generally yellowish-red throughout. {137}The skulls present a good deal of variation in the form of the internal orbital angles of the frontal, and in the occipital, bones. DISTRIBUTION.--Sumatra: Padang, Indrapoera, Bencoolen, Palembang, and the Lampongs.