Semnopithecus potenziani, Bp., C. R., xliii., p. 412 (1856).
Presbytis chrysogaster, Licht.; Peters, P. Z. S., 1866, p. 429; Blyth, Mamm. Burma, p. 10 (1875).
Semnopithecus chrysogaster, Licht.; Peters, M. B. Akad. Berl., 1879, p. 830, pl. iv.b; id., P. Z. S., 1866, p. 429; Blanford, Faun. Brit. Ind., Mamm., p. 38 (1891).
Characters.—Nearly allied to S. entellus. Face flattened and black; muzzle long and broad; head without a crest; some long superciliary hairs projecting in front, black; whiskers long, running down to the chin, and projecting outwards and backwards, partly concealing the ears, and of a reddish-yellow colour; beard short, also reddish-yellow; hair on the top of the head longer than on the back of the head and temples, black or dark ashy-grey, washed, especially on the front of the head, with rufous; neck, back, upper part of arm, lower portion of the fore-arm, outside of the thighs, and tail (except the tufted tip, which is black), ashy-grey—all these parts being slightly washed with rufous; hands and feet, black; remainder of the limbs rufous; throat, chest, and fore part of the under surface, rich orange-yellow, paler on the hind part of the belly and on the inner side of the limbs. Length of body, 18 inches; of tail, 28½ inches, and with the tuft, 31 inches. Cranium globular; supra-orbital ridges not prominent.
The young have the fur soft, silky, and rather long, and are much paler than the adults, and of a soft delicate grey, yellowish-white taking the place of the rufous colour of the adults. (Anderson.)
Distribution.—Northern Assam, Arracan, Upper Burma, and Tenasserim. Dr. Anderson observed a troop of this species at Tsingu Myo on the left bank of the Irawaddy, at the lower end of the first defile.
Habits.—This species lives in small troops in the forest. When young it is of a mild disposition; but, when fully adult, the males are ill-natured and fierce.
III. THE HANUMAN LANGUR. SEMNOPITHECUS ENTELLUS.
L'entelle, Audeb., Singes, Fam. V., sect. ii., fig. 2 (1797).
Simia entellus, Dufresne, Bull. Soc. Philom., i., p. 49 (1797).