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, 150, (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 NATUNZ (Thomas and Hartert). 
Semnopithecus natune 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. 
