1920.] G. A. BouLENGER : Frogs of the Genus Rana. 13 



Vomerine teeth in small, round or oblique groups on a level 

 with the posterior borders of the choanae or just behind them, 

 equally distinct from each other and from the latter, or closer 

 together. Tongue as in the preceding species. 



Form less robust than in the preceding, with more distinct 

 waist. 



Head broader than long, rarely as long as broad, much 

 depressed ; snout rounded or very obtusely pointed, scarcely pro- 

 jecting beyond the mouth, as long as or longer than the eye ; 

 canthus rostralis indistinct ; loreal region very oblique, feebly con- 

 cave ; nostril equally distant from the eye and from the end of 

 the snout, or a little nearer the former ; distance between the 

 nostrils equal to or a little greater or a little less than the inter- 

 orbital width, which is usually much narrower than (not more than 

 half) that of the upper eyelid ; tympanum s to nearh" once the 

 diameter of the e3'e, i^ to 5 times as long as its distance from the 

 latter. 



Fingers more or less pointed, with a more or less distinct 

 dermal border, first and second equal, third longer than the snout; 

 subarticular tubercles small, feebly prominent. 



Hind limb rather thick, moderately long, the tibio-tarsal 

 articulation reaching the tympanum, the eye, or between the eye 

 and the nostril, the heels meeting or not when the limbs are 

 folded at right angles to the body ; tibia 2^ to 3^ times as long as 

 broad, 2 to 2-| times in length from snout to vent, shorter than 

 the fore limb or than the foot. Toes with the tips swollen or 

 dilated into very small discs, with very broad web reaching the 

 tips, the free border very feebly emarginate ; the fourth toe not 

 extending very much beyond the third and fifth; outer metatar- 

 sals separated nearly to the base ; subarticular tubercles very 

 small, feebly prominent ; a strong dermal fringe on the outer toe ; 

 tarsal fold feeble or absent ; a small but very prominent, pointed, 

 digitiform inner metatarsal tubercle, its base • to i the length of 

 the inner toe ; no outer tubercle. 



Skin of upper parts with large pores, smooth or granular, often 

 with small warts which may be tipped with minute asperities ; 

 a strong fold from the eye to the shoulder, often connected with its 

 fellow across the head just behind the eyes. Lower parts smooth. 



Greyish or olive above, with dark olive round spots or mar- 

 blings ; a more or less distinct dark, light-edged band along each 

 flank, and on the front and back of the thighs, often disappearing 

 in the adult ; spots not forming complete cross-bands on the limbs. 

 Lower parts white, marbled spotted, dotted or vermiculated with 

 blackish. 



Males with a grey or blackish external vocal sac on each side, 

 projecting through a slit close to the posterior half of the mandi- 

 bular ramus, the slit as long as or a little longer than the eye ; no 

 other secondary sexual characters. 



Skeleton as in R. hexadactyla, but nasal bones smaller and 

 terminal phalanges of toes a little expanded at the end. 



