PYGATHRIX 39 
212; Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, 
Brit. Mus., 1870, p. 16; Schleg., Mus. Pays-Bas, Simiz, 1876, 
p. 34; Anders., Zool. Exped. Yunnan, 1878, p. 39; Hose, 
Mamm. Borneo, 1893, p. 12. 
Semnopithecus (Trachypithecus) frontatus Reichenb., Vollstand. 
Naturg. Affen, 1862, p. 90, pl. XV, figs. 211, 212. 
Pygathrix frontata Lyon, U. S. Nat. Mus., XL, 1911, p. 140. 
WHITE-FRONTED LANGUR. 
Type locality. East of River Banjer, southeast Borneo. Type 
in Leyden Museum. 
Geogr. Distr. Southeastern Borneo. 
Genl. Char. Bald triangular wrinkled area between eyebrows; 
median crest erect, overhanging forehead; hair on cheeks long, depend- 
ent; forehead narrow, high; facial portion of skull short; orbits broad. 
Color. Triangular spot on head white; line between eyes and nose, 
and line on margin of upper lip and lower lip flesh color; rest of 
face and the nose black; lips covered with short yellow hairs; hairs on 
head diverge on three sides from the bare spot; long black hairs from 
forehead over and behind eyes, extend backward over temples and 
cheeks in a lengthened point to behind ear; crest rises from behind 
the bare spot, and extends over center of head to nape, of equal length 
throughout, and with the hairs on top of head, is blackish brown; 
entire upper parts of body, and outer side of arms to shoulders Prout’s 
brown; forearms above from wrist black, grading to dark brown above 
elbows; hands, legs below knees, and feet, black; thighs, blackish 
brown; lower part of cheeks, throat, inner side of limbs, and entire 
under parts of body pale reddish, inclining to yellowish on cheeks, 
breast and beneath arms; tail above black at base, rest greenish olive, 
beneath brownish black at root, remainder greenish olive like the upper 
part. Ex type Leyden Museum. 
Measurements. Total length, 1,200; tail, 760; foot, 155, (skin). 
Skull: total length, 93.5; occipito-nasal length, 91.6; zygomatic width, 
72.4; length of upper molar series, 25; length of mandible, 64.6; length 
of lower molar series, 28.8. Ex type Leyden Museum. 
This is a brown monkey, with partially black limbs and wholly 
black hands and feet. It differs in many ways, besides coloration, from 
the next species from northwest Borneo. The skull has a high arched 
narrow forehead, with the superior outline circular; the bare space 
on forehead is triangular in shape and white, (it is square and yellow 
in the northern species, possibly in life it is orange yellow). Besides 
