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. Closely related and very similar to _S. hosii_, but the cheeks do not form a connected white area with the white forehead, the space being broken by a black band from the edge of the mouth to the ear (in the young male and in the female). In the old male the upper parts of the cheeks are quite black. Length of body, 24½ inches; tail, about 32 inches. DISTRIBUTION.--The present species was discovered in the Langkat district in the North-east of Sumatra, by Mr. Iversen, a Norwegian traveller in that island, and is named after Mr. Oldfield Thomas, the well-known Mammalogist of the British Museum.