1920.] G. A. BouLENGER : Frogs of the Genus Rana. 7 



Tympanum | to | diameter of eye ; first finger a little 

 longer than second ; tibia if to 2| limes in length 

 from snout to vent ; heels overlapping ; male without 

 vocal sacs, without tooth-like processes in lower jaw R. doriae, Blgr. 



-j-j- Toes I to nearly entirely webbed ; male with the interorbital region 

 very convex, swollen behind, with tooth-like processes in the lower 

 jaw, no vocal sacs, and the tympanum as large as or a little 

 larger than the eye. 

 Tibia at least twice in length from snout to vent ; inner 

 metatarsal tubercle ^ to | length of inner toe ; inter- 

 orbital swelling of male rounded behind ... R. macrognathus, Blgr. 

 Tibia at least twice in length from snout to vent ; inner 

 metatarsal tubercle | to ^ length of inner toe ; inter- 

 orbital swelling of male followed by a dermal flap ... R. pileafa, Blgr. 

 Tibia i4 to 2 times in length from snout to vent ; inner 

 metatarsal tubercle about f length of inner toe ; back 

 with 8 or 10 glandular longitudinal folds ; interorbital 

 swelling of male followed by a knob-like prominence R. plicatella, Stol. 



fit Toes I to I webbed ; tibia if to 2 times in length from snout to 

 vent. 

 Tympanum ^ to f diameter of eye ; inner metatarsal 

 tubercle feebly prominent, f to 4 length of inner toe ; 

 male without vocal sacs, without tooth-like promi- 

 nences in lower jaw ... ... ... R. Iiascheana, Sto\. 



Tympanum f to f diameter of eye ; inner metatarsal 

 tubercle very prominent, | to f length of inner toe; 

 male with vocal sacs and tooth-like prominences in 

 lower jaw ... ... ... ... R. limbo rgit, ^ . Sc\. 



■** Tibia 4 to 5 times as long as broad, less than twice in length from 

 snout to vent ; toes f to f webbed ; first finger as long as or a 

 little longer than second ; nasal bones moderately large and 

 separated from each other. 

 No dorso-lateral fold ; male without vocal sacs, with 



rather small tooth-like prominences in lower jaw .. R. ruicrodisca, Boettg. 

 A dorso-lateral fold ; male with vocal sacs, without 



tooth-like prominences in lower jaw ... ... R. palavanensis, "QXgr. 



$. Vomerine teeth in nearly transverse series 

 on a level with the posterior borders of the 

 choanae ; nostrils close to the tip of the 

 snout ; tympanum ^ diameter of eye ; first 

 finger longer than second ; toes nearly 

 entirely webbed ... ... ... R. narina, Stein. 



B. Tympanum hidden or but feebly distinct ; tips of toes dilated into more or 



less distinct discs : male without vocal sacs, without enlargement of the 

 fore limb, with large tooth-like prominences in front of lower jaw; nasal 

 bones in contact with each other ; omosternal style forked at the base. 

 Tibio-tarsal articulation reaching temple or posterior 



border of eye ; heels not meeting ; tibia 2 to 2h times 



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



to vent ; toes entirely webbed ; first finger usually a 



litde shorter than second ... ... •■ R. corriigata, Peters. 



Tibio-tarsal articulation reaching temple or eye ; heels 



meeting or not ; tibia 2^ to 3 times as long as broad, 



2 to 2^ times in length from snout to vent ; toes 



entirely or nearly entirely webbed ; first finger as 



long as or a little longer than second ... ... R. knhlii, D. et B, 



Tibio-tarsal articulation reaching beyond eye ; heels 



overlapping ; tibia 2\ to 3^ times as long as broad, 



i| to 2 times in length from snout to vent ; toes \ to 



nearly entirely webbed ; first finger as long as or a 



little longer than second ... ... ... R. laficeps, B\gr. 



C. Tympanum hidden or only moderately distinct ; no tooth-like processes in 



front of lower jaw ; omosternal style not forked at the base. 

 /. Tibio-tarsal articulation not reaching beyond eye ; no dorso-lateral fold ; 



