THE ORIENTAL REGION 133 



genera of mammals found in the Indian Sub-region, which 

 do not extend their range further eastwards into the Burmo- 

 Chinese Sub-region. Of these, thirteen are to be met with 

 also in the Pakearctic and Ethiopian Regions, leaving only 

 six confined to the Indian Sub-region. These six are — 



(1) Tetraceros (Four-horned Antelope). 



(2) Antilope (Black Buck). 



(3) Boselaphus (Nylghaie). 



(4) Platacanthomys (Spiny Rat). 



(5) Melursus (Indian Bear). 



(6) Loris (Slender Lemur). 



Of these, Loris alone is characteristic of Southern 

 India and Ceylon (the Ceylonese Sub-region of Wallace). 

 Melursus is found in Ceylon, but occurs also all over the 

 peninsula of India from the Himalayas southwards. 

 Platacanthomys inhabits the western Ghats and the 

 Animali hills of Southern India alone, and not Ceylon ; 

 the remaining three genera are distributed over the whole 

 of the Indian peninsula, but do not reach Ceylon. 



There is, therefore, only one genus of mammals con- 

 fined to the Ceylonese Sub-region of Wallace, and this 

 hardly seems to afford an adequate reason for separating 

 it from the Indian Sub-region proper. The chief ground 

 for so doing, according to Mr. Wallace, is the existence 

 there of a peculiar family of snakes — the Uropeltidte, or 

 Rough-tails, which are entirely confined to Wallace's 

 Ceylonese Sub-region. Examples of these reptiles, how- 

 ever, have been recorded in India as far north as Ganjam, 

 in 20° N. lat., and it seems probable that they may 

 eventually be found all over the peninsula south of the 

 great plains of the Indus and the Ganges. 



Secondly, as regards Celebes, this island certainly 



