1920.] G. A. BouLENGER : Frogs of the Genus Rana. 137 



Vomerine teeth in oblique groups or short series between the 

 choanae, extending more or less beyond the level of their posterior 

 borders. 



Head much depressed, as long as broad or slightly ionger than 

 broad ; snout rounded or obtusely pointed, projecting more or less 

 beyond the mouth, as long as or slightly shorter than the eye ; 

 canthus rostrahs distinct ; loreal region feebly oblique, concave ; 

 nostril nearer the end of the snout than the eye ; distance between 

 the nostrils greater than the interorbital width, which equals or is 

 a little less than that of the upper eyelid ; tympanum very dis- 

 tinct, I to § the diameter of the eye and 3 to 5 times its distance 

 from the latter. 



Fingers rather slender, with feebly swollen tips, first longer 

 than the second, third much longer than the snout ; subarticular 

 tubercles large, very prominent. 



Hind limb moderately long, the tibio-tarsal articulation reach- 

 ing the eye or between the eye and the tip of the snout, the heels 

 overlapping when the limbs are folded at right angles to the body ; 

 tibia 4 to 4^ times as long as broad, about twice in length 

 from snout to vent, shorter than the fore limb, as long as or 

 slightly shorter than the foot. Toes rather slender, the tips 

 dilated into very small discs with a groove between the upper and 

 the lower surface, f to f webbed, 2 or 3 phalanges of fourth free; 

 outer metatarsals separated nearly to the base ; subarticular 

 tubercles moderate, very prominent ; no tarsal fold ; inner meta- 

 tarsal tubercle oval or elliptic, prominent, | to | the length of the 

 inner toe ; a very prominent, round outer tubercle. 



Upper parts smooth or finely granulate, some males rough with 

 small spinose tubercles ; a very prominent and very broad glandu- 

 lar dorso-lateral fold, from above the tympanum, broken up behind 

 the sacral region, its greatest width at least equal to that of the 

 upper e5''elid ; the distance between the folds, on the back, ,} to 1 

 the length from snout to vent ; two strong glands behind the 

 angle of the mouth ; lower parts smooth. 



Greyish olive or pale brown above, uniform or with irregular 

 darker spots ; sides with black spots ; a dark streak on the canthus 

 rostralis and, usuaUy, a dark temporal blotch, which may be con- 

 tinued along the side of the body ; a white streak on the upper lip; 

 limbs with dark cross-bands ; hinder side of thighs with black spots. 

 Lower parts white, uniform or with some greyish spots on the 

 throat and breast. 



Males with internal vocal sacs, with very thick fore limbs and 

 a strong pad on the inner side of the first finger, covered with a 

 yellowish velvet-like horny layer. 



Nasal bones rather small, widely separated from each other 

 and from the frontoparietals ; ethmoid exposed in front. Terminal 

 phalanges feebly expanded at the end. 



