1892.] NEW MONKEY FROM SUMATRA. G15 



down to the underside of the ear. The undersides of the head 

 (lips included) and the whole of the underside of the body are white 

 or whitish. The limbs are coloured on their outer sides as on the 

 back ; the hands and feet are black. The inner sides of the limbs 

 are white like the belly. The upperside of the tail is grey, like the 

 back, the underside white ; only the extreme point is greyish brown 

 both above and below. 



The iris is brown. 



The old male is slightly darker than the younger male and the 

 females ; the top of the head, and the sides from the eyebrows down 

 to about the angle of the mouth, are black or blackish. The forehead 

 is whitish. The limbs are also darker downwards ; the lower part 

 of the hind limb is mostly black. 



The young one, in silky dress, is whitish. The head is almost 

 entirely white, and likewise the hind limbs ; the hands and feet are 

 whitish; the back, shoulders, and uppersides of the fore limbs, as 

 well as the upperside of the tail, are greyish (almost like the old 

 ones) ; in the centre of the back there is a whitish patch. 



The crest on the crown already forms a distinct point on the 

 occiput, whilst the side crests and whiskers are barely discernible. 

 Along the neck runs a black central stripe. 



The distal portion of the tail is somewhat more hairy than the 

 proximal. 



The Skull. 



Old male. Old female, 



millim. millim. 



Greatest length 104 97* 



Zygomatic breadth 80 74 



Distance from i^^ to anterior margin of 



foramen magnum 73 63 



Intertemporal constriction 46 46 



Breadth across face 64'.5 65 



Breadth of brain-case 69 63 



Interorbital breadth 8 8 



Breadth of orbit 26 25 



' Height of orbit 23 21 



Breadth of nasal opening 11 10 



Height of nasal opening 18 17 



Length of nasal bone 12 10-5 



Length of palate 34 30 



Breadth of palate inside ^ 22 20 



Combined length of upper pp. and mm. . 27 27 



Combined length of upper molars 18 18 



Height of upper canine 20 9 f 



The zygomatic arch is prominent and strong. The breadth 

 across the zygomata is equal in the female to the distance from the 

 posterior margin of foramen magnum to the base of i;^; in the male 



* Approximate length, the os occipitale being broken, 

 t Very much worn. 



