gata 
PYGATHRIX 19 
Subfamily 2. Colobine. 
GENUS I. PYGATHRIX. 
2 =: 7. —- r. 3 M. a3 = 32. 
PYGATHRIX E. Geoffroy, Ann. Mus. Hist. Nat. Paris, XIX, 1812, 
p. 90. Type Simia nemeus Linnzus. 
Presbytis Esch., Kotz. Entd-Reise Siid-See u.n. Berings-Strass., 
&c., ITI, 1821, p. 196, pl. 
Semnopithéque F. Cuv., Hist. Nat. Mamm., III, 1821, Livr. 
XXX, pl. . 
Semnopithecus F. Cuv., Dents Mamm., 1825, p. 247, pl. IV. 
Trachypithecus Reichenb., Vollstand. Naturg. Affen, 1862, p. 89, 
-_ pls. XV, XVI, figs. 198-225. 
Kasi Reichenb., Vollstand. Naturg. Affen, 1862, p. 101, pl. XVII, 
figs. 234, 235, 240, 241. 
Entellus Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. 
Mus., 1870, p. 14. 
Corypithecus Trouess., Rev. Mag. Zool., 3me Sér., VII, 1879, 
p. 53. 
Lophopithecus Trouess., Rev. Mag. Zool., 3me Sér., VII, 1879, 
6.53. 
Presbypithecus Trouess., Rev. Mag. Zool., 3me Sér., VII, 1879, 
pp. 52, 56, 
Body slender, elongate ; tail long, slender ; limbs long; head round ; 
muzzle short; thumb short with a flat nail; cheek pouches absent; 
laryngeal sac present ; ridge of stiff hairs projecting forward over eyes. 
Skull with rounded braincase; large orbits; projecting superciliary 
ridge; upper molars with four cusps; posterior lower molar with five 
cusps. Stomach large, pouches several. 
The Langurs, as the members of the genus PyGaTHRIX are usually 
called, resemble, in general appearance, the Guenons of the genus 
LasiopyGA, but are distinguished from them outwardly, by the short 
thumb, absence of whiskers, and the shorter muzzle; while the head 
is often ornamented by the elongation of the hairs on the occiput; and 
internally they differ from all the Old World Primates, except the 
