1920.] G. A. BOULENGER : Frogs of the Genus Rana. 147 



Vomerine teeth in short transverse or oblique series between 

 the choana?, sometimes extending a little beyond the level of their 

 posterior borders, equally distant from each other and from the 

 choana:-, or nearer to each other. 



Head as long as broad or a little longer than broad, much de- 

 pressed ; snout a little longer than the eye, rounded or obtusely 

 pointed and prominent ; canthus rostralis obtuse ; loreal region 

 feebly oblique, deeply concave ; nostril a little nearer the end of 

 the snout than the eye; distance between the nostrils equal to the 

 interorbital width, which nearly equals that of the upper eyelid; 

 tympanum very distinct, f to nearly once the diameter of the e3^e, 



3 to 8 times as long as its distance from the latter. 



Fingers rather long, with very small discs without or with a 

 very indistinct transverse groove ; first finger much longer than 

 the second, third longer than the snout ; subarticular tubercles 

 large, very prominent. 



Hind limb rather long, the tibio-tarsal articulation reaching 

 the eye or between the eye and the nostril, heels strongly overlap- 

 ping w^hen the limbs are folded at right angles to the body ; tibia 



4 to 4I times as long as broad, i;] to 2 times in length from snout 

 to vent, shorter than the fore limb, as long as or slightly longer 

 than the foot. Toes with small discs more developed than those 

 of the fingers, bearing a groove separating the upper from the lower 

 surface, |- to f webbed, the web not quite reaching the discs of the 

 third and fifth, 3 phalanges of fourth free; outer metatarsals 

 separated nearly to the base; subarticular tubercles strong; no 

 tarsal fold ; inner metatarsal tubercle oval, about ^ the length of 

 the inner toe ; a very prominent, round outer tubercle. 



Skin strongly granulate on the head and back, often with larger 

 warts on the sides; a strong and broad glandular dorso-lateral 

 fold from above the tympanum to the hip, its distance from its 

 fellow 5 to 6 times in length from snout to vent ; a glandular fold 

 from below the eye to the shoulder, followed by a glandule. 

 Lower parts smooth. 



Brown above, with small or large black spots or marblings ; 

 sides sometimes black, with white spots or marblings ; loreal and 

 temporal regions dark brown or black, tympanum reddish brown; 

 canthus rostralis, dorso-lateral fold, and upper lip white; limbs 

 with blackish cross-bands ; hinder side of thighs marbled black 

 and white. lyower parts white, spotted or marbled with brown. 



Males with a large, greyish external vocal sac on each side 

 ,below the mandible, extending from below the centre of the eyQ to 

 the fore limb ; a large gland on the inner side of the arm.. 



Nasal bones small, widely separated from each other and. from 

 the frontoparietals ; ethmoid largely exposed above, truncate in 

 front, not extending to between the nasals. 



