1920.] G. A. BouLENGBR : Frogs of the Genus Rana. 41 



extremes being completely connected. The differences in the colora- 

 tion on which Flower laid stress at first, have since been shown by 

 himself to be inconstant. 



Forma typica. 



Vomerine teeth in long and strong, straight or slightly curved, 

 oblique series between the choanae and extending much be^'ond 

 the level of their posterior borders ; in young specimens often 

 shorter, less oblique, and entirely behind the choanae. Lower jaw 

 with two bony prominences in front, feebly developed and barely 

 indicated in females, large, acutely pointed, directed backwards, and 

 fitting into deep pits in the upper jaw, in adult males. 



Head large, especially in males, much depressed, the sides of 

 the occiput very swollen in males, broader than long ; snout rounded 

 or obtusel^^ pointed, feebly or slightly projecting beyond the 

 mouth, as long as or, usually, longer than the eye, which may be 

 rather small in the adult ; canthus rostralis very obtuse, sometimes 

 very indistinct ; loreal region very oblique, slightly concave ; 

 nostril much nearer the end of the snout than the eye ; the dis- 

 tance between the nostrils equal to or less than the interorbital 

 width in the adult; interorbital width i to i^ times that of the 

 upper e3'elid, narrower in the young ; tympanum very distinct, 

 I to I the diameter of the eye and t to once its distance from the 

 latter. 



Fingers rather short or moderate, obtuse or shghtly swollen at 

 the end, first much longer than the second, third as long as or a 

 little shorter than the snout ; second and third usually with a 

 more or less distinct dermal fold on each side ; subarticular 

 tubercles moderate, moderately 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 

 more or less overlapping, sometimes very slightly, when the 

 limbs are folded at right angles to the body ; tibia 3 to 4 times as 

 long as broad, if to 2i times in length from snout to vent, usually 

 shorter than the fore limb, as long as or a little longer than the 

 foot. Toes moderately long, the tips dilated into very small 

 discs, entireh^ webbed, the web always reaching the discs but 

 rather strongly emarginate and usually forming only a narrow 

 border to the penultimate phalanx of the fourth ; subarticular 

 tubercles moderately large, moderately prominent; a short and 

 feeble tarsal fold, sometimes indistinct ; inner metatarsal tubercle 

 narrow, feebly prominent, I to f the length of the inner toe ; no 

 outer tubercle. 



Skin smooth or wart}^ above ; sometimes a transverse fold 

 across the head, behind the eyes ; a strong glandular fold from 

 the eye to the shoulder, often forming an angle above the tj'-m- 

 panum ; posterior part of upper eyelids warty ; young with a 

 narrow glandular fold on each side of the back, beginning behind 

 the upper eyelid, sometimes very short. Lower parts smooth. 



