94 APAEGALARAX 
median length of nasals, 12; palatal length, 49.3; length of upper 
molar series, 47.5; length of mandible, 91.5; length of lower molar 
series, 44.4. Ex type British Museum. 
The unique specimen, the type of the species, was received by the 
British Museum from Chumbi, Thibet. It is a female with the feet 
and most of the tail wanting. It is chiefly remarkable for its woolly 
coat, quite unlike the pelage of P. scuistacea. It probably repre- 
sents a form dwelling among the higher mountains, possibly mainly 
to the north of the Himalayas, whose coat has been modified to enable 
the wearer to successfully withstand the low temperature of those 
regions. The skull is generally larger than one of a female of P. 
SCHISTACEA; it is broader across the orbits, the orbits themselves 
are much larger, and the orbital ridges greatly arched; the rostrum is 
broader at base; the palate is longer and its roof flatter; the orbital 
ridge is more prominent, the depression at the frontal is much greater, 
and the braincase broader; unfortunately the posterior portion of the 
skull of P. scHISTACEA is wanting and a comparison posterior to the 
pterygoids cannot be made; the skull of P. Lanta indicates a larger 
animal, but it is impossible to say whether this is an individual trait or 
a specific character. There are five lower incisors but this must be 
regarded as abnormal, although the teeth are in no wise crowded. 
PYGATHRIX PILEATA (Blyth). 
The Assam Entellus Monkey Blyth, Journ. Asiat. Soc. Beng., 
XVI, 1847, p. 732. 
Semnopithecus pileatus Blyth, Journ. Asiat. Soc. Beng., XII, 1843, 
p. 174; XIII, 1844, p. 467; Wagn., Schreb., Saugth. Suppl., 
V, 1855, p. 30, pl. XX VI; Horsf., Cat. Mamm. Mus. E. Ind. 
Co., 1857, p. 7; Hutton, Proc,’ Zool. Soc.’ Lond., 1667, p. 
946; Schleg., Mus. Pays-Bas, Simiz, 1876, p. 57; Anders., 
Zool. Res. Exped. Yunnan, 1877, p. 13; Id. Cat. Ind. Mus. 
Calc., 1881, p. 40; Blanf., Faun. Brit. Ind, Mamm., 1891, 
p. 37, fig. 9; Forbes, Handb. Primates, IT, 1894, p. 103. 
Presbytis pileatus (!) Blyth, Journ. Asiat. Soc. Beng., XVI, 1847, 
Dp. 709, ert, pl. XA VI, figs o> ALAV, lasso, D, 2,) Cnt. ammeg 
Id. Cat’ Mamm*’ Mus. *Astat:’Soc: Beng., “1663, 1p. 12; Was 
Mamm. Burma, 1875, p. 10. 
Semnopithecus (Trachypithecus) pileatus Reichenb., Vollstand. 
Naturg. Affen, 1862, p. 92, not figured. 
BONNETED LANGUR. 
Type locality. Malay Peninsula? Type not in Calcutta Museum. 
