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.
HABITS.--"The type of this Monkey--the Bangat of the Kayans--was shot," writes Mr. Charles Hose (after whom the species is named), "at a place called Niah, in the Baram district. I have procured several specimens in different parts of the country, but although it is often seen in the low country, I think we must consider it to be a mountain species, which leaves the mountains at certain times in search of fruit. It ascends Mount Dulit to the height of 4,000 feet, but is more common at 2,000 feet. It frequents the salt-springs, which are common in the interior, churning up the mud, and it is at these salt-springs that the Punans procure numbers of specimens with the blow-pipe and poisoned arrows. From this Monkey the Bezoar stones are obtained, being found either in the gall bladder or the intestines. The noise that the animal makes is loud and distinct--_Gagah, gagah_. The young { 119}resemble the colour of the adult, and are exceedingly pretty little things, but they do not live long in confinement, and would never bear a voyage to England, as they suffer severely from sea-sickness."
XI. THOMAS'S LANGUR. SEMNOPITHECUS THOMASI.
_Semnopithecus thomasi_, Collett, P. Z. S., 1892, p. 613, pl. xlii.
DESCRIPTION.--A central occipital crest sloping at first backwards, reversed on the back of the head, black on the crown; with a lower indistinct crest on each side of the white forehead. General colour above dark grey--each hair being partly black and partly white; underneath, white; a black stripe from the upper jaw to the ear, and a black central stripe on the forehead; hands and feet black. (_Collett._)
Very old males are darker in colour, with the upper part of the head brownish-black, the front whitish. Old females are smaller; the young are silky and nearly white all over.