Presbytes argentatus, Blyth; Horsf. Cat. Mamm. E. I. Co. Mus., p. 7 (1851).
Semnopithecus nigrimanus et S. cinereus, Mivart, P. Z. S., 1864, pp. 625, 626.
Presbytes cristatus (nec Raffles) et P. melanolophus, Blyth, Mamm. Burma, p. 9 (1875).
Characters.—Head with a compressed blackish crest; hairs radiating from the forehead over the eyes; crown above grey, mingled with black, becoming black on the front of the crest and nape of the neck; flanks, under surface of the body and tail, as well as the inner side of the limbs, dirty white; hands and feet whitish, mixed with black or reddish hairs; upper surface of the tail dark grey, the tip paler and tufted; ears and face deep black; legs flesh-coloured; chin and throat white. Length of body, 20½ inches; of tail, 28½ inches.
The hind-most lower molar has generally only four tubercles.
The variety of this species inhabiting Siam has a fleshy-white area round the eyes and mouth.
Distribution.—Siam; the Malay Peninsula; and Sumatra.
XXIX. THE MOUPIN LANGUR. SEMNOPITHECUS ROXELLANÆ.
Semnopithecus roxellanæ, A. Milne-Edwards, C. R., lxx., p. 341 (1870); Schl., Mus. Pays-Bas, vii., p. 65 (1876).
Rhinopithecus roxellanæ, id., Rech., Mammif., p. 233, pls. xxxvi., xxxvii. (1868-1874); Blyth, Mamm. Burm., p. 11 (1875).