12 SIMIID^, 



Genus Semnopithectts, P. Cuv.^ 

 * Semnopithecus baebei, Blyth. 



? Semnopitheais maiirus, Heifer^ Journ. As. Soc. Bengal, vol. xii. 1843, p. 358. 



Presbijtis Barbel, Blyth, Journ. As. Soc. Bengal, vol. xvi. 1847, p. 734; vol. xliv. 1875, ex. no. 

 p. 11 j Cat. Mamm. As. Soc. Mus. 1863, p. 14. 



This species has no crest, nor is the hair so elongated on the occiput as in 

 S. obscurus, Reid, but the hair on the side of the head, before the ears, is long and 

 outwardly projecting. The adults of both sexes are alike in colour, and the general 

 hue is dark blackish-fuliginous, but the shoulders, fore-limbs, exclusive of the 

 hands, the front of the tibial portions of the hind limbs, the back and sides of the 

 head and the tail, are feebly washed with silvery grey over the dark fur. The 

 hands, feet, eyebrows, and whiskers are black. The under parts are concolorous 

 with the general tint of the body. There is no trace of a white stripe on the inside 

 of the limbs. The hair on the vertex is moderately long and directed backwards ; 

 on the lips there is a narrow fringe of short yellowish hairs, and there is a short 

 beard. The skin of the face is bluish black. 



Length of body 1 foot 7J inches, tail 2 feet 5 inches. 



The skull of S. barhei has the comparatively elongated interorbital region of 

 S. ohsGurus, but its nasals are very much broader and form a considerable suture 

 with the frontal, and the facial portion of the skull is also less forwardly projected 

 than in that species. The orbits in both of these species are more or less rounded, 

 while in *S'. siamensis they are transversely broader than high, and contracted to- 

 wards their inner side and associated with a short interorbital septum. 



There is a very close similarity between the under surfaces of the skulls of 

 S. ohscurus and S. barhei, but the latter is distinguished by a much shorter palate 

 and by a somewhat more curved dental line than in >S'. ohscurus. 



The teeth of S. barhei are somewhat smaller than in ^S*. ohscurus. The last 

 molar of the lower jaw of S. barhei and S, ohscurus has a well-developed fifth 

 talon, as in the majority of the Semnopitheci. 



The symphysis of the lower jaw of S. barhei is not so deep as in S. ohscurus, 

 but it is much broader in front and more flattened than in S. ohscurus. 



^ The genera Semnopithecus and Presbytis were both created in 1821, the first by F. Cuvier (Hist. Nat. des Mammif. 

 vol.^ ii. Juillet 1821) for the reception of S, melalophus and S. entellus, which, like the majority of their allies, are 

 distinguished by having three tubercles or cusps on the last inferior molar, while the second, Preslytis, was founded 

 by Eschscholtz on S. mitratus, which has only four tubercles on the last inferior molar. Mivart,2 however, has 

 recently shown that certain individuals of S. siamensis agree with ;S'. mitratus in the absence of the fifth talon, and that 

 much importance cannot be attached to its absence or presence, as we find Gallago {Otog ale) pallida, Gray, subject 

 to a similar variation, and also Nycticihus javanicus, Is. Geoff., as recorded by Huxley.^ The circumstance, therefore, 

 that the genus Semnopithecus more accurately portrays the general characters of the group than Presbytis and the' 

 faj3t that It has been adopted by the great majority of naturalists, in preference to the latter term, are the reasons 

 which lead me to adopt it. 



2 Proc. Zool. Soc. 1864, p. 636. 3 Ihid, p. 323. 



