MAMMALS OF BORNEO. 7 



relative development of the yellow and black rings on the 

 hair. The rings occur on the exposed portion of the hair, 

 the hidden part of which is grey. The upper surface of the 

 head, the mesial line of the back, and the upper surface of the 

 tail near its base, are deep brown or even blackish, more es- 

 pecially on the head and over the hind quarters. The ex- 

 tremities pale towards the hands and feet, which are light 

 oli\'e-brown. The outsides of the thighs have an olive-grey 

 tint. Some animals, however, especially the fully grown ones, 

 are almost uniformly coloured deep olive-brown except on 

 the blackish head and the middle line of the back. The sides 

 of the face and the under surfaces generally are greyish, 

 tending to white; but on the sides of the face the hair is 

 washed with a dark, almost blackish grey. The face is nude, 

 of a dusky flesh colour, which is the tint also pervading 

 the almost naked ears and the callosities. A few scattered 

 hairs occur about the mouth. On the top of the head, es- 

 pecially on the dark coloured area, the hairs in the adult are 

 short, rather erect and profuse; on the under parts they are 

 rather sparse, especially on the abdomen. The muzzle is 

 rather long and dog-like ; the body is short, compact, and 

 broad chested, with moderately long, powerful limbs. The 

 head is somewhat flattened above, with pronounced supraor- 

 bital ridges. The limbs are relatively longer than in J/. 

 leommis. The tail is little more than one-third the length 

 of the body and head, and is rather sparsely clad, contracting 

 somewhat to a point and carried erect, being somewhat down- 

 wardly curved near the tip. 



There are not the marked variations between different 

 specimens that are found in J/. Iconiniis, Blyth, to which this 

 form is most closely allied, the males and females being alike, 

 and the young are only a little more richly coloured than the 

 adults. These later attain to a great size, as is evinced by the 

 dimensions of the cranium of the adult. I have seen specimens 

 standing at the shoulder as high as a good sized mastiff and 

 quite as powerful. 



The chief feature of the skull is the great development of 

 the facial portion, which is thrown much forwards. 



A yellow specimen of this monkey was procured at Long 

 Salai in the Baram district. These monkeys are easily tamed 

 by the natives, and in some places they are used to climb the 

 cocoanut trees to throw down the nut, the monkeys having 

 been taught to throw down only the ripe ones. The Dyak 

 name is ' Brok,' and the Kayan name ' Koyut.' Sometimes 

 these animals are very savage, and will attack a dog when 

 provoked. 



Hab. Baram River (C. Hose). Mount Dulit (C. Hose). 



