PYGATHRIX 95 
Geogr. Distr. Assam and hills to the south of the valley, Sylhet, 
Tipperah, Chittagong, northern Arakan and part of Upper Burma, 
(Blanford). 
Genl. Char. Allied to P. ENTELLUS but smaller. 
Color. Top of head, hair brown; long black hairs on forehead ; 
upper back, hair brown graduating into pale gray, and then into a 
cream buff on the rump; sides of head tawny, this color extending 
on to the shoulders, along the edge of the arms and lower sides of 
body; arms pale yellowish gray, hands blackish brown, under side of 
body, throat, inner side of arms and legs orange buff; feet dark gray; 
tail pale gray, graduating into purplish black on apical third. Ex 
specimen Calcutta Museum. 
Measurements. Total length, 1,690; tail, 1,030; foot, 195, (skin). 
Skull: total length, 116.2; occipito-nasal length, 96.3; intertemporal 
width, 50.4; width of braincase, 65.5; Hensel, 77.2; zygomatic width, 
86.3 ; median length of nasals, 11; palatal length, 36; length of upper 
canines, 18.4; length of upper molar series, 30.7; length of mandible, 
81.6; length of lower molar series, 39. 
In some adult males the upper parts are gray to the tail, no cream 
buff or any other color showing. 
PYGATHRIX HYPOLEUCA (Blyth). 
Semnopithecus hypoleucus Blyth, Journ. Asiat. Soc. Beng., X, 
1841, p. 839; XII, 1843, p. 170; XIII, 1844, pp. 470, 476; 
XVI, 1847, pp. 733, 1271, pl. XXVI, fig. 1; Jd. Ann. Mag. 
Nat. Hist., XX, 2nd Ser., 1851, p. 313; Horsf., Cat. Mamm. 
Mus. E. Ind. Co., 1851, p. 14; Wagn., Schreb., Saugth. 
Suppl., V, 1855, p. 31; Reichenb., Vollstand. Naturg. Affen, 
1862, p. 99, figs. 231, 232; Anders., Zool. Res. Exped. Yun- 
nan, 1877, p. 20; Id. Cat. Mamm. Ind. Mus. Calc., 1881, p. 
40; Blanf., Faun. Brit. Ind., 1891, p. 33; Forbes, Handb. 
Primates, IT, 1894, p. 110. 
Semnopithecus johni var. Martin, Mammif. Anim., 1841, p. 489; 
Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. 
Mus., 1870, p. 14. 
Semnopithecus dussumieri 1. Geoff., Compt. Rend., XV, 1842, p. 
719; Id. Archiv. Mus. Hist. Nat. Paris. II, 1843, p. 538, pl. 
XXX; V, 1852, p. 537; Id. Cat. Primates, 1851, p. 13; Gerv., 
Hist. Nat. Mamm., 1854, p. 61, pl. IV; Dahlb., Stud. Zool. 
Fam. Reg. Anim. Nat., fasc. I, 1856, pp. 87, 89; Reichenb., 
