PYGATHRIX 57 



darkest at knee, where it is blackish brown, gradually fading away 

 towards hip and ankle; ankles and feet black; chin, sides of neck, 

 throat, inner side of limbs and under parts of body grayish white ; 

 tail above like back, grading into dark brown with whitish hairs inter- 

 mingled on apical half, beneath grayish white at root remainder like 

 upper side. Ex type British Museum. 



Measurements. Total length, 1,120; tail, 620; foot, ISO, (skin). 

 Skull : total length, 89.5 ; occipito-nasal length, 77.7 ; intertemporal 

 width, 43.5 ; Hensel, 58.7 ; zygomatic width, 70.3 ; breadth of brain- 

 case, 50.3; median length of nasals, .69; palatal length, 25.2; length 

 of upper molar series, 21.2; length of mandible, 54.2; length of lower 

 molar series, 27. Ex type British Museum. 



This is a pale species of a drab color with very white thighs both 

 on outer and inner sides. It differs from P. rhionis in its pale legs 

 and general color of the upper parts, and from P. cana by lacking the 

 pale occipital crest, and black legs. 



Pygathrix natun^ (Thomas and Hartert). 



Semnopithecus natuna Thos. and Hart., Novitat. Zool., I, 1894, 

 p. 652. 



NATUNA LANGUR. 



Type locality. Mount Ranai, Island of Natuna. Type in British 

 Museum. 



Geogr. Distr. Island of Natuna. 



Genl. Char. Hair radiating from a point on forehead, crested 

 on occiput. 



Color. Head black ; occiput, hind neck, and upper parts of body 

 purplish black, hairs gray at base; outer side of arms, line on outer 

 edge of thighs, and outer side of legs below knees, together with hands 

 and feet jet black; sides of face and neck, chin, throat, under parts 

 of body, outer side of thighs to below knees, inner side of the knees, and 

 inner side of arms to wrist white; tail at base like back, remainder 

 black ; space around eyes and on upper lip flesh color, rest of face 

 black. Ex type British Museum. 



Measurements. Total length, 1,170; tail, 690; foot, 160. Skull: 

 total length, 90.3 ; occipito-nasal length, 77.5 ; intertemporal width, 

 23.4; breadth of braincase, 54.3; Hensel, 24.5; zygomatic width, 66.3; 

 median length of nasals, .68 ; palatal length, 27 ; length of upper molar 

 series, 23.9 ; length of mandible, 66 ; length of lower molar series, 29.2. 

 Ex type British Museum. 



