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 roxellana 

 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 roxellance. 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 bieti. 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 



*Pygathiux. 



