128 Records of the Indian Mttseum. [Vol,. XX, 



First finger much shorter than second; tibia if times 

 as length from snout to vent ; toes nearly entirely 

 webbed ; head longer than broad ; tympanum ;T dia- 

 meter of eye ... ... ... ... R. meanisii, Stejn. 



2. Glandular dorso-lateral fold absent ; toes entirely or nearly entirely webbed. 

 a. Tympanum very distinct, ^ to 4 diameter of eye ; discs of fingers not 

 br<iader than long. 



a, Tibio-tarsal articulation reaching between eye and nostril ; belly granu- 



late. 



Tibia 5 times as long as broad, li times in length from 

 snout to vent ; first finger as long as second; tym- 

 panum f diameter of eye ; back smooth ... R. everetti, Blgr. 



Tibia 2^ times in length from snout to vent ; first finger 

 longer than second ; tympanum \ diameter of eye ; 

 head and back very rough with large tubercles ... R. ishikava, Stejn. 



fl. Tibio-tarsal articulation reaching beyond tip of snout ; tibia i^ to if 

 times in length from snout to vent. 



First finger as long as second ; tibia 5^ to 6 times as 

 long as broad ; tympanum f diameter of eye; belly 

 smooth ... ... ... ... R. crassiovis, Blgr. 



First finger shorter than second ; tibia 6 times as long 

 as broad ; tympanum f diameter of eye ; belly granu- 

 late ... ... ... ... ... R. kamptni, Blgr. 



F"irst finger as long as or longer than second , tym- 

 panum ^ to f diameter of eye ; belly granulate ; male 

 with external vocal sacs ... ... ... R. livida, Blyth. 



b. Tympanum more or less distinct, or obscured by granules, not \ dia- 



meter of eye; discs of fingers very large, often broader than long, 

 with a transverse groove on the upper surface, corresponding to the 

 long horizontal limb of the terminal phalanx ; first finger as long as 

 or shorter than second. 

 a. Third finger not more than twice as long as snout, first with well- 

 developed terminal disc; foot shorter than tibia. 

 Snout shorter than eye ; tibio-tarsal articulation reaching 

 tip of snout or not quite so far ; tibia 3^ to 4 times as 

 long as broad, i| to 2 times in length from snout to 

 vent; male without vocal sacs ... ... R.ricketti, Blgr. 



Snout as long as eve ; tibio-tarsal articulation reaching 

 beyond tip of snout ; tibia 4 to 5I times as long as 

 broad, if to if times in length from snout to vent; 

 male with external vocal sacs ... ... R. latopalmata, Blgr. 



j8. Third finger more than twice as long as snout, 

 N'omerine teeth present ; first finger with the tip merely 

 swollen ; tibio-tarsal articulation reaching beyond tip 

 of snout ; tibia 4 to 4^ times as long as broad, i^ to if 

 times in length from snout to \'ent ; foot shorter than 

 tibia; male with internal vocal sacs ... ... R. httnalayana, Blgr. 



X'omerine teeth present ; first finger with the tip merely 

 swollen ; tibio-tarsal articulation reaching nostril or 

 tip of snout; tibia 4^ to 5.V times as long as broad, 

 i| to i§ times in length from snout to vent; foot as 

 long as or slightly shorter than tibia ; male with inter- 

 nal vocal sacs ... ... ... ... R. for mosa, Gthr. 



Vomerine teeth absent ; first finger with well-developed 

 terminal disc ; tibio-tarsal articulation reaching tip of 

 snout or slightly beyond ; tibia 4 times as long as 

 broad, if to i| times in length from snout to vent ; 

 foot shorter than tibia ... ... ... R. hai}ia}tensis, Blgr. 



The classification of the numerous species included in this 

 subgenus presents great difficulties. A linear arrangement is best 

 based on the degree of specialization of the fingers and toes, as 

 expressing the general drift of evolution, and this has been 



