1920.] G. A. BouLENGER : Frogs of the Genus Rana. 123 



Subgenus Hylorana. 



Tschudi, Class. Batr. p. 37 (183!^). 



Tips of toes, or of fingers and toes, dilated into more or less 

 distinct discs bearing a crescentic or horseshoe-shaped groove 

 separating the upper from the lower surface ' ; outer metatarsals 

 separated nearly to the base, or, rarely, bound together in their 

 basal half; omosternal style not forked at the base, sometimes 

 with a very small notch ; terminal phalanges with feeble transverse 

 expansion, or T-shaped with the transverse limb short or long. 



I. Discs of fingers, if present, without the above-mentioned groove, or with the 

 groove very indistinct. 



A. Fingers obtuse, first not longer than second, with 



a rudiment of pollex projecting as a knob or 

 spine ; tibio-tarsal articulation reaching eye or 

 between eye and nostril ; heels not oserlap- 

 ping; tibia 3 times as long as broad; head broad- 

 er than long, loreal region nearly vertical ; 

 tvnipanum | to J diameter of e)e : toes | or 

 nearly entirely webbed ; doiso-lateral fold in- 

 complete or absent : male without \ocal sacs. 

 with a large gland above axil ... .. R. Iiolsii, Blgr. 



B. F'ingers with swollen tips, first longer than 



second : tibio-tarsal articulation reaching tym- 

 panum or eye ; heels not or but feebly overlap- 

 ping; tibia 4 to 45 times as long as broad ; head 

 large ; loreal region oblique ; tympanum f to 

 once diameter of eye ; toes f or nearly entirely 

 webbed ; dorso-lateral fold narrow ; male with 

 internal vocal sacs ... ... . R. airtipes, }erd. . 



C. Fingers with swollen or dilated tips : heels overlapping ; head moderately 



large, not broader than long. 

 I. Fingers with the tips merely swollen, first longer than second ; dorso- 

 lateral fold extending to hip. or broken up behind the sacrum. 

 a. Toes I to nearly entirely webbed; tibia 4 to 5 times as long as broad, 

 ij to 2 times in length from snout to vent. 



\'omerine teeth in long and strong series touching the 

 anterior corners of the choanae ; head a little longer 

 than broad ; snout longer than eye ; loreal region 

 moderately oblique ; tympanum | to ''j diameter of 

 eye ; tibio-tarsal articulation reaching between eye and 

 tip of snout ; dorso-lateral fold narrow or rather broad ; 

 male with external vocal sacs and a humeral gland R. guentheri. BIgr. 



N'omerine teeth in oblique groups usually extending 

 bejond level of posterior borders of choanae ; head as 

 long as broad: snout not longer than eye ; loreal re- 

 gion moderately oblique; tympanum J to \ diaiueter 

 of eye; tibio-tarsal articulation reaching nostril or tip 



of snout ; dorso-lateral fold broad or rather broad ; , 



male with internal vocal sacs and a humeral gland R. mort^nseni. Blgr./ - 



N'omerine teeth in oblique groups extending more or 

 less beyond level of posterior borders of choanae ; 

 head as long as broad or slightly longer ; snout not 

 longer than eye ; loreal region feebly oblique ; tym- 

 panum 5 to 5 diameter of eye ; tibio-tarsal articulation 

 reaching eye or between eye and tip of snout ; dorso- 

 lateral lold very broad ; male with internal vocal sacs 

 and no humeral or cubital gland . ... /?. /ai'oMc/ii!, Blgr. 



' Absent in some specimens of R. ctirttpes. 



