PYGATHRIX 65 
intertemporal width, 46.6; Hensel, 57.6; zygomatic width, 67.8; 
breadth of braincase, 53.4; median length of nasals, 10; palatal length, 
26.4; length of upper molar series, 25.9; length of mandible, 60.8; 
length of lower molar series, 28. Ex type British Museum. 
Mr. Hose, (1. c.) says of this species that “this handsome monkey 
is perhaps my finest discovery among the Mammals. The type was 
shot at a place called Niah in the Baram district. I have since pro- 
cured several specimens in different parts of the country, but although 
it is often seen in the low country I think we must consider it to be 
a mountain species which leaves the mountains at certain times in 
search of fruit. It ascends Mt. Dulit to the height of 4,000 feet, but 
is more common at 2,000 feet. It frequents the salt springs which 
are common in the interior, churning up the mud, and it is at these 
salt springs that the Punans procure numbers of specimens with the 
blow pipe and poisoned arrows. From this monkey the Bezoar stones 
are obtained, being found either in the gall bladder or near it. The 
noise that this animal makes is loud and distinct—“Gagah, gagah!’ 
The young resemble the color of the adults, and are exceedingly pretty 
little things, but they won’t live long in confinement and would never 
bear a voyage to England, as they suffer severely from sea sickness. 
The Kyan name is ‘Bengat.’ ” 
PyGaATHRIX THOMAS! (Collett). 
Semnopithecus thomasi Collett, Proc. Zool. Soc. Lond., 1892, p. 
613, pl. XIII; Forbes, Handb. Primates, II, 1894, p. 119. 
THOMAS’S LANGUR. 
Type locality. Langkat district, northeast Sumatra. Type in 
the University Zoological Museum at Christiania, Norway. 
Geogr. Distr. Northeast Sumatra. 
Genl. Char. Similar to P. Hose1, but the white of the forehead 
and cheeks is separated by a black band running from the mouth to 
the ear. Pointed crest, sloping from forehead backward, and from 
occiput forwards; tail very long. 
Color. Crest white with a black stripe in the center on front, and 
another on sides from before ears to apex, which is also black; upper 
parts of body and sides, and outer side of limbs dark gray; black stripe 
from upper jaw to ear; cheeks, chin, sides of neck, entire under parts, 
and inner side of limbs white; hands and feet black; tail above dark 
gray, beneath creamy white. Iris brown. Ex co-type British Museum. 
Old male is darker, with upper part of head brownish black, front 
whitish, and upper part of cheeks black. 
