1920.] G. A. BouLENGER : Frogs of the Genus Rana. 127 



times as long as broad, \\ to 1" times in lenglli from 



snout to vent ... ... ... ... R. papiia, I, ess. 



Tibio-tarsal articulation reaching eye or between eye 

 and nostril ; heels feebly overlapping ; tibia 3| to 4 

 times as long as broad, 2 to 2,^. times in length from 

 snout to vent ... ... ... R. daemeli, Sidr. 



2. Discs of fingers as large as those of the toes ; 



no complete dorso-Iateral fold ; tibio-tarsal ar- 

 ticulation reaching tip of snout or a little be- 

 yond ; tibia 3,\ to 5 times as long as broad, l| 

 to 2 times in length from snout to vent ; 

 tympanum A diameter of eye ; male with large 

 external vocal sacs and a humeral gland .. /?. swinhoana, Blgr. 



3. Discs of fingers as large as or a little smaller than those of toes ; tibio- 



tarsal articulation reaching far beyond tip of snout; tibia 6 to 7s times as 

 long as broad, i^f to i| times in length from snout to vent; tympanum 

 ^ to f diameter of eye ; male with external vocal sacs and no humeral 

 gland. 

 No dorso-lateral fold ; nostril slightly nearer eye than 



tip of snout ; tympanum deeply sunk ... ... R. cavity mpanttm, Blgr. 



Dorso-lateral fold, if present, not extending to sacrum ; 



nostril nearer tip of snout than eye ... ... R.ivhiteJieadi, Blgr. 



Dorso-lateral fold extending to hip; nostril equally 

 distant from eye and from tip of snout, or a little near- 

 er latter ... ... ... .. R. jerboa, Gthr. 



C. Tips of fingers dilated into large or rather large discs, larger than those 

 of the toes, the width of which equals at least twice that of the narrowest 

 part of the penultimate phalanx. 

 I. Glandular dorso-lateral fold more or less distinct, at least anteriorly. 



a. First finger as long as or slightly shorter than second ; tibia 4 to 6 times 



as long as broad. 

 a. Male with internal vocalsacs; dorso-lateral fold feebly prominent and 

 usually incomplete. 

 Tibio-tarsal articulation reaching beyond tip of snout ; 

 toes entirely webbed ; head as long as broad or slight- 

 ly longer ; tympanum | to f diameter of eye ; male 

 without humeral gland . . ... ... R. Iiosii, Blgr. 



Tibio-tarsal articulation reaching tip of snout or not 

 quite so far or a little beyond ; toes webbed to the 

 discs of the third and fifth ; head longer than broad ; 

 tympanum f to f diameter of eye ; male without 

 humeral gland ... ... ... ... R. chalconota, Sch\eg. 



Tibio-tarsal articulation reaching nostril or tip of snout ; 

 toes f webbed ; head as long as broad ; snout shorter 

 than eye ; tympanum ^ diameter of eye ; male with 

 a humeral gland ... ... ... ... R. macrops, Blgr. 



J8. Male with external vocal sacs and no humeral gland ; tibio-tarsal arti- 

 culation reaching beyond tip of snout ; toes entirely or nearly entirely 

 webbed ; head as long as broad or a little longer. 

 Dorso-lateral fold distinct only anteriorly ; tympanum 



I to f diameter of eye ... ... ... R.graminea, Blgr. 



Dorso-lateral fold narrow, complete ; tympanum ^ to ^ 



diameter of eye ... ... ... ... R. motiticola, And. 



b. First finger shorter than second : dorso-lateral fold narrow, cornplete , 



tibio-tarsal articulation reaching beyond tip of snout. 

 First finger a little shorter than second ; tibia 6 times 



as long as broad, i^ to i4 times in length from snout to 



vent ; toes nearly entirely webbed ; head as long as 



broad ; tympanum ^ to f diameter of eye ... R, gerbilliis, Annand. 



First finger a little shorter than second; tibia 6 to6| 



times as long as broad, i^ to if times in length from 



snout to vent ; toes webbed to the discs of the third 



and fifth ; head as long as broad or slightly longer ; 



tympanum f to | diameter of eye ... ... R. liizonensis, Blgr. 



