_Semnopithecus obscurus_, Reid, P. Z. S., 1837, p. 14; Martin, Mammif. An., p. 486 (1841); Murie, P. Z. S., 1865, p. 742; Gray, Cat. Monkeys Brit. Mus., p. 14 (1870); Schl., Mus. Pays-Bas, vii., p. 49 (1876); Anders., Zool. Res. Yun-nan Exped., p. 25 (1878; with full synonymy); Thomas, P. Z. S., 1886, p. 66; Blanford, Faun. Brit. Ind., Mamm., p. 41 (1891). _Semnopithecus leucomystax_, Müll. and Schl., Verhandl., p. 59 (1839-44). _Semnopithecus albocinereus_, Less., Sp. Mammif., p. 65 (1840). _Presbytis obscura_, Gray, Hand. List Mamm. Brit. Mus., p. 3 (1843); Blyth, J. A. S. Beng., xiii., p. 467 (1844). _Semnopithecus halonifer_, Cantor, Proc. Linn. Soc., 1845, p. 235. CHARACTERS.--Hair on crown not radiating; longer at the back, forming a tuft of yellowish-white. Body blackish-brown, darker on the forehead, sides of face, sides of body and limbs; hands and feet black; nape of neck, and along the middle of back, brownish; tail brownish, not tufted; under surface and inside of limbs not so dark as the back or sides; face black, but the mouth and eyelids whitish; length of body, 21 inches; of tail, 32 inches. FEMALE.--Slightly browner than the male. YOUNG.--Bright golden-red, but very soon changing to the colour of the adult. {124}Mr. Thomas mentions (P. Z. S., 1886, p. 66) a very remarkably coloured individual, differing from all others in having its crest, nape, arms, legs, and tail, yellow, contrasting markedly with the dark hues of the face, body, and feet. It is, however, approached by a specimen in the British Museum from Malacca, collected by Dr. Cantor, which has the crest yellow, and the limbs and tail lighter than usual. Its auditory bullæ, however, are larger and more projecting, and its teeth smaller than is usually the case with _S. obscurus_. DISTRIBUTION.--Siam; the Malayan Peninsula; Tenasserim, Mt. Mooleyit, at 5,000 feet. XVI. ANDERSON'S LANGUR. SEMNOPITHECUS HOLOTEPHREUS. _Semnopithecus holotephreus_, Ander., Zool. Res. Exped. Yun-nan, p. 27 (1878). CHARACTERS.--"Uniform dark slaty-grey passing into black on the fore-arm and hands, and also on the feet. Under surface and inner side of the fore-limbs and thighs, pale yellowish-grey. Head slightly crested over the vertex, but with only a feeble tendency to lateral compression. Supra-orbital hairs moderately long and black. Whiskers rather long, directed backwards and outwards, hiding the ears in front. Face bluish-black; area round the eyes and lips white. Length of body, 21½ inches; tail, 24½ inches." (_Anderson._) DISTRIBUTION AND HABITS.--Unknown. XVII. GERMAIN'S LANGUR. SEMNOPITHECUS GERMAINI. _Semnopithecus germaini_, Milne-Edwards, Bull. Soc. Philom., Séance, 12, Feb., 1876; Anderson, Zool. Res. Exped. Yun-nan, p. 27 (1878); Schl., Mus. Pays-Bas, vii., p. 34 (1876).