112 GEOGRAPHICAL DISTRIBUTION 



of species (167:139), the number of genera being about the 

 same (27 : 26). There is no family peculiar to it. The Firmister- 

 nian families Ranidce and Engystomatidce are represented by nume- 

 rous genera and species, and the Dyscophidce by one ; the Arcifera 

 by Bufonidce, Pelobatidce, and Hylidce ; the latter, however, occur in 

 the northern parts only, in two species very closely related to 

 the Europo-Asiatic Hyla arborea. Two forms of Caudata occur, 

 viz. Tylototriton, in Yunnan and the Himalayas, and a species 

 of the otherwise entirely North-American genus Amblystoma, 

 which has been found in the mountains of Laos. These forms, 

 however, cannot be considered to be characteristic of the Indian 

 Region, but should be regarded as immigrants from the Northern Zone"; 

 and, in fact, they seem to be limited to such altitudes as compensate 

 the difference of latitude. Another Europo-Asiatic immigrant in 

 the northern parts is the widely distributed Bufo viridis. Five 

 species of Apoda occur belonging to three genera, two of which are 

 peculiar to the Region, the other being represented by a species in 

 West Africa. 



ECAUDATA. 



Fiemisternia. Number of Species. 



Ranidce. 



Oxyglossus* 3 



Rana 48 



Rhacophorus 23 



Ixalus* 27 



Cornufer 2 



Nyctibatrachus* 2 



Nannobatrachus* 1 



Nyctixalus * 1 



Nannophrys * 2 



Engystomatidce. 



Melanobatrachus * 1 



Calophrynus 2 



Microbyla * 5 



Oallula* 7 



Cacopus * 2 



Glyphoglossus * 1 



Dyscophidce. 



Cahuella* 1 



Arcifera. 



Bufonidce. 



Nectophryne 3 



Bufo 22 



Nectes * 1 



Hxjlidce. 



Hyla 2 



Pelobatidce. 



Leptobrachium* 2 



Xenophrys * 1 



Megalopbrys * 2 



