Chapter XXIV: The White-Fronted Langur. Semnopithecus Frontatus

_Semnopithecus frontatus_, Müll., Tijds., Nat. Ges., v., p. 136, pls. i.
and ii. (1838); Martin, Mammif. An., p. 475 (1841); Gray, Cat. Monkeys
Brit. Mus., p. 16 (1870); Schl., Mus. Pays-Bas, vii., p. 34 (1876);
Anderson, Zool. Res. Exped. Yun-nan, p. 39 (1878; with full synonymy);
Hose, Mamm. Borneo, p. 12 (1893).

CHARACTERS.--General colour dark yellowish-brown, with a wash of red on the flanks in some specimens; the tail tufted. This species is at once recognised by the bald triangular wrinkled area between the eyebrows, of a milky-white colour, the rest of the face being deep black, except the flesh-coloured lips. It is also remarkable for the erect median crest over-arching the forehead; and by the long dependent black hairs on the cheeks from near the nose, increasing in length on {134}the hindmost part of the cheek, and reaching nearly to the shoulder.

The skull has a highly arched, narrow and retreating forehead; the facial portion is short.

DISTRIBUTION.--South-east Borneo, where it is very rare.