THE LANGURS. 



119 



resemble tlie 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. 



Senmopithecus tJiomasi, Collett, P. Z. S., 1892, p. 613, pi. xlii. 



Description. — A central occipital crest sloping at first back- 

 wards, 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 fore- 

 head ; 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 6". 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, 24}^ inches; tail, about 32 inches. 



Distril3ution. — The present species was discovered in the Lang- 

 kat 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. 



Habits — These Monkeys live in small companies composed 

 of both sexes, in the highest trees in dry spots of the forest, 

 never descending of their own accord to the ground, nor visit- 



