44 PYGATHRIX 
95.7; occipito-nasal length, 87; Hensel, 63.5; zygomatic width, 72.2; 
intertemporal width, 43; palatal length, 28.4; median length of nasals, 
10; length of upper molar series, 24.9; length of mandible, 66.3; length 
of lower molar series, 27.1. 
This form differs from P. CHRYSOMELAS, in having on the upper 
parts various tints of brown instead of black, according to the indi- 
vidual or sexual peculiarities of examples, and the throat and chest 
black not brown. Each kind represents a fairly distinct island species. 
PYGATHRIX BATUANA (Miller). 
Presbytis batuanus (!) Miller, Miscel. Coll. Smith. Instit., Wash., . 
1903, p. 670. 
Type locality. Pulo Pinie, Batu Islands. Type in United States 
National Museum. 
Genl. Char. Similar to P. sumMAaTRANA but smaller, tail shorter, 
and white at root beneath. 
Color. General hue black, with crown and back washed with 
brownish; inner side of thighs, belly, median line of chest grayish 
white; tail above like body, beneath grayish white at root, grading 
into black at tip. Ex type United States National Museum. 
Measurements. Total length, 1,150; tail, 665; foot, 163. Skull: 
greatest length, 912; occipito-nasal length, 80.8; zygomatic width, 
70.5; Hensel, 58.5; intertemporal width, 40.7; palatal length, 28.6; 
median length of nasals, 11.7; length of upper molar series, 22.9; 
length of mandible, 62.5; length of lower molar series, 28.4. Ex type 
United States National Museum. 
This species differs from its ally, P. SUMATRANA, in having a 
smaller skull, with shorter slighter canines, and quite a different 
mandible, this being very broad at the angle, and the ascending ramus 
is also very wide and with a deep lateral pit; the mandible of the 
Sumatran form being rather light and slender, and with a narrow 
ascending ramus, its anterior edge much curved outwardly and then 
backward, ending in a point. In body and limb measurements the two 
differ much. 
PYGATHRIX PERCURA (Lyon). 
Presbytis percura Lyon, Proc. U. S. Nat. Mus., XXXIV, 1908, 
p. 671. 
Type locality. Kompei, eastern Sumatra. Type in United States 
National Museum. 
