8 Records of the Indian Museum. [Vol. XX. 



toes entirely or nearly entirely webbed ; breeding male with much thickened 

 fore limb and horny spinules on the inner fingers and on the breast. 



a. Tympanum distinct ; a tarsal fold ; male with internal vocal sacs. 



a. Tibio-tarsal articulation reaching eye ; tibia 2| to 35 times as long as 

 broad, twice in length from snout to vent. 

 First finger longer than second ; tips of toes not swollen ; 



inner metatarsal tubercle f length of inner toe ... R.feae, Blgr. 

 First and second fingers equal ; tips of toes slightly 

 dilated; inner metatarsal tubercle compressed, sharp- 

 edged ... ... ... ...-■/?. yiinnanensis, Aud. ^ , ,a / 



First finger slighdy longei- than second ; tips of toes 



swollen ; inner metatarsal tubercle f length of inner . 



toe ... ... ... ...- YR. tibetana, Blgr. "' ' 



0. Tibio-tarsal articulation reaching temple or 

 posterior border of eye ; tibia 3 to 3I times 

 as long as broad, 2I to 2^ times in length 

 from snout to vent ; first finger as long as 

 or a little shorter than second ; tips of toes 

 obtuse or slightly swollen ; inner metatarsal 

 tubercle J to 5 length of inner toe ...:' R. sternosignata, Murr./i. 7/ 



b. Tympanum hidden or very indistinct ; first finger longer than second. 

 Tibio-tarsal articulation reaching shoulder or tympa- 

 num ; tibia 2'- times as long as broad, 2i to 25 times 



in length from snout to vent ■ heels not overlapping ; 

 tips of toes not swollen ; inner metatarsal tubercle \ 



length of inner toe ; male with internal vocal sacs ..- i.R. plirynoiiies, Blgr. , 

 Tibio-tarsal articulation reaching eye , tibia 2| to 3^ 

 times as long as broad, about twice in length from 

 snout to vent ; heels overlapping ; tips of toes swollen ; 

 inner metatarsal tubercle § length of inner toe ; male 

 with internal vocal sacs ... ... ..._.: R. spiiiosa, David. 



Tibio-tarsal articulation reaching eye ; tibia if to 

 nearly 2 times in length from snout to \ent ; heels 

 overlapping ; tips of toes swollen ; inner metatarsal 

 tubercle \ length of inner toe ; male without vocal 

 sacs ... ... ... ... ..J:.R. gammiei, .\nd. 



II. Tibio-tarsal articulation reaching nostril, tip of snout, or beyond; heels 

 overlapping; tibia 3 to 4 times as long as broad, if to 2 times in length 

 from snout to vent ; first finger as long as or a little shorter than second ; 

 tips of toes swollen. 



a. Male with much thickened fore limb, with horny spinules on the inner 



finger and on the breast. 



Head a little broader than long : tympanum feebly dis- 

 tinct ; toes J webbed ; dorso-lateral fold distinct only ., 

 in front ; male without vocal sacs ... ... R. anna nd alii, Blgr. 7/^ 



Head much broader than long ; tympanum hidden or 

 very indistinct ; toes entirely webbed ; a dorso-lateral _^ , 



fold usually distinct ; male with internal vocal sacs . .■-'''^ R. liebigii, Gthr. '''''' l*''*^ 



b. Male with fore limb not much thickened, without spinules, without vocal 



sacs ; head a little broader than long. 

 Tympanum distinct ; toes entirely webbed ; a feeble ^^ 



dorso-lateral fold ... ... ...-! R. assamensis, W . ScX. iC ' 



Tympanum hidden ; toes entirely webbed ; no dorso- 

 lateral fold ... ... ' ... ..■ 'R. vidua. Stol. 



Tympanum verj- indistinct ; toes f to | webbed ; no 



dorso-lateral fold .. ...' R. b!an/orc/ii, Blgr./ ' - Mv. 



H. A glandular dorso-lateral fold.i connected with the supratemporal fold; 

 tympanum very distinct, smooth. 

 A. Omosternal style not forked at the base. 



I. Outer metatarsals separated nearly to the base. 



a Canthus rostralis very obtuse or indistinct : interorbital space much 



1 Absent or indistinct in some specimens of R. gi-ahami and R. malabarica. 



