RHINOPITHECUS 107 
the general appearance more that of a true *Presbytis than a Rhino- 
pithecus. No well-marked crest on crown of head, the hairs in this 
region only slightly longer than on the neck; in bieti a conspicuous 
crest is present in both sexes. Ears not concealed by dense tufts of 
hair, rather more marked than in the Mekong species. Skull like that 
of bieti as regards the general shape, but smaller and with smaller 
cheek-teeth. Supraorbital region rather more like that of roxellane 
than of bieti; muzzle formed as in the latter species, without any well- 
marked concave depression of the premaxillary region. Interorbital 
breadth less than in roxellane. Zygomatic arches almost parallel, not 
expanded laterally.” 
Color. “General colour of dorsal surface deep black, tinged with 
brownish on the crown and nape; the black coloration extends all over 
the dorsal surface, both of body and limbs. Sides of face and fore- 
head creamy white tinted with buff, the colour gradually darkening on 
the back of the forehead and merging into the dark blackish brown 
of the crown. Supra-orbital line of stiff black hairs well developed. 
_ Face around eyes naked and apparently flesh-coloured; a crescent- 
shaped row of creamy-white hairs extending from the temporal region 
on to and across the cheek. Sides of neck orange-buff, the bright 
buff-coloured hairs forming a most conspicuous border to the dark- 
coloured nape. Ears with creamy-white tufts arising from their inner 
sides. Rump with two prominent buffy-white patches on either side 
of the tail, connecting with the light-coloured markings on the backs 
of the thighs, but not forming the large conspicuous light-coloured 
areas such as occur in bdieti. Backs of hands and feet covered with 
rather short black hairs, the hair not sufficiently long to conceal the 
digits nor extending over the nails. Entire ventral surface of body 
yellowish buff, the buff tint most dominant on the throat and anterior 
portion of the belly; no trace of any grey or dark-coloured hairs on 
the chest and neck. Inner sides of arms yellowish white, the colour 
almost white at the elbow and visible from above as a light cream- 
coloured border, the contrast between the black hairs on the outer side 
and the bright yellowish white of the inner side of the arm being most 
marked. The light yellowish colour extends right down the inner 
sides of the limbs as far as the hands and feet, where it is somewhat 
duller and dirtier. Tail long, measuring 100 mm. longer than that of 
bieti; clothed with comparatively short hairs, except at the tip, where 
the hairs are rather longer and form a distinct tuft. Colour, above 
*PyYGATHRIX. 
