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



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

 longer than second; tibia if to 2\ times in length 

 from snout to vent ; heels overlapping ; male without 

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



ft 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 i to ^ length of inner toe ; inter- 

 orbital swelling of male rounded behind /?. macrogiiafhus, Blgr. 

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

 metatarsal tubercle \ to 5 length of inner toe ; inter- 

 orbital swelling of male followed by a dermal flap .. /?. pileata, Blgr. 

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

 metatarsal tubercle about | length of inner toe ; back 

 with 8 or lo glandular longitudinal folds ; interorbital 

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



•j-i-f Toes I to ^ webbed ; tibia i| to 2 times in length from snout to 

 vent. 

 Tympanum A to \ diameter of eye ; inner metatarsal 

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

 male without vocal sacs, without toolh-like promi- 

 nences in lower jaw ... ... ... R. hascheana, S>io\. 



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 i-gii, \^ . Sc\. 



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

 snout to vent ; toes | 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. microdisca, Boettg. 

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



tooth-like prominences in lower jaw ... ... R. palavanensis, Blgr. 



j8. 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 5 diameter of eye ; first 

 finger longer than second ; toes nearly 

 entirely webbed ... ... ... R. iiai'tna, Stejn. 



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 2j times 



as long as broad, 23 to 25 times in length from snout 



to vent ; toes entirely webbed ; first finger usually a 



little shorter than second ... ... ..-' R. corriigata, Pclevs. 



Tibio-tarsal articulation reaching temple or eye ; heels 



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



2 to 2j 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. kultlii, D. et B. 



Tibio-tarsal articulation reaching beyond eye ; heels ,_^ 



overlapping ; tibia 25 to 35 times as long as broad, 



1 1 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. laticeps, 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 ; 



