{117}CHARACTERS.--Allied to _S. hosii_, _S. everetti_, and _S. thomasi_. Body, tail, and limbs grey; forehead with a high vertical median crest, commencing on the brow, black, with some white hairs; superciliary bristles long, black, projected forward over the eyes; hairs of the forehead on each side of the crest, flat against the head, white over the whole crown (with a few black hairs), but darker tipped on the back of the head; sides of the face from the orbits to the ears quite black; occipital hairs directed backward, not forward as in _S. thomasi_. Chin, sides of neck, throat, and chest greyish, not white as in the allied species. Under side of the body and inner side of the upper arms, and the legs to the ankles white, becoming greyer distally; hands and feet shining black; fore-arms to the wrists, and legs to the ankles, grizzled grey, as also the tail, above and below. Skin of face probably flesh-coloured between and across the orbits and round the cheeks, elsewhere black. Length of body, 23½ inches; tail, 30 inches. Cranium broader and rounder than in the allied species; the ascending process of the maxillary bones articulating with the frontals, shutting out the former bones from the side of the nasals. In the allied species the skin of the face is nearly, or quite, black all over, and the chin, sides of the neck, the throat, and the chest are pure white. DISTRIBUTION.--Paitan, N. Borneo. Discovered by the veteran Bornean traveller Alfred Everett. X. HOSE'S LANGUR. SEMNOPITHECUS HOSII. (_Plate XXXV._) _Semnopithecus hosii_, Thomas, P. Z. S., 1889, p. 159, pl. xvi.; Hose, Mamm. Borneo, p. 10 (1893). CHARACTERS.--Crown with a longitudinal central crest, the hairs sloping evenly backward, with no reversed tuft of hair on the back of the head; general colour of back, shoulders, outer sides of limbs, and tail (though darker above than below) {118}hoary grey, the hairs being commingled black and white; crest, centre of crown, and nape deep glossy black; all the rest of the head, forehead, temples, sides of crown and neck, cheeks, lips, septum of nose, tufted chin, front of neck, chest, under side of body and the inside of the limbs as far as the middle of the fore-arm and lower leg pure white; hands and feet deep black; face black. Nasal bones long and thin, the profile quite straight and continuous with the line of the forehead. Length of body, 20½ inches; of tail, 26¼ inches. (_Thomas._) This handsome species differs from all known _Semnopitheci_ in the marked contrast in colour presented by its black crest and white forehead and cheeks. DISTRIBUTION.--Niah, in the Baram district; Mount Dulit, Mount Batu Song: all in Sarawak, Borneo.