1920.J O. A. BoT'LENGER : I-'rogs of the Genus Rana. 151 



Habitai. Peninsular Siam (Khao Bang Lai and Nakon Sita- 

 marat). 



Distinguished from R. Imineralis by the shorter limbs, the 

 much shorter and less strongly webbed foot, the proportions of the 

 fingers, the more oblique loreal region, and the narrower inter- 

 orbital space. 



76 Rana oatcsii. 



Riuui otitfiii, Boulcny. Ann. and Mat;. X.H. |(). IX, iScjj, p. 141, pi. ix. 



Vomerine teeth in strong oblique series on a level with the 

 anterior borders of the choanae, nearly touchin.' the latter. 



Head longer than broad, much depressed; snout pointed, 

 strongly projecting beyond the mouth, longer than the eye ; canthus 

 rostralis obtuse ; loreal region feebly oblique, deeply concave ; 

 nostril much nearer the tip of the snout than the eye ; distance 

 between the nostrils equal to the interorbital width, or the width 

 of the upper eyelid ; tympanum very distinjt, f to f the diameter 

 of the eye, 2i to 4 times its distance from the latter. 



Fingers long and slender, the tips dilated into scarcely devel- 

 oped discs with a groove separating the upper from the lower 

 surface ; first finger longer than the second, third a little longer 

 than the snout ; subarticular tubercles moderately developed. 



Hind limb rather long, the tibio-tarsal articulation reaching 

 between the eye and the tip of the snout, the heels strongly over- 

 lapping when the Hmbs are folded at right angles to the bod}' ; 

 tibia 4 to 4^ times as long as broad, ^ or a little more than + the 

 length of head and body, shorter than the fore limb, as long as the 

 foot. Toes with the tips dilated into very small discs, same as the 

 fifagers, nearly entirely webbed ; outer metatarsals separated nearly 

 to the base; subarticular tubercles small, feebly prominent; no 

 tarsal fold ; inner metatarsal tubercle oval, feebly prominent, ^ to 

 I the length of the inner toe ; no outer tubercle 



vSkiu finely granulate above ; a prominent grandular dorso- 

 lateral fold from above the tympanum to the hip, about half as 

 broad as the upper e\'elid ; the distance between these folds, on 

 the back, 6 times in length of head and body; another glandular 

 fold from below the e\-e to the shoulder, followed by a prominent 

 glandule. Lower parts smooth. 



Black above, uniform or marbled with pale brown, and with 

 five whitish streaks, the middle extending from between the nos- 

 trils to above the vent, the upper pair running along the glandu- 

 lar lateral folds, the lower pair from the end of the snout along 

 the uj)per lip, which is edged with brown, to the groin ; sides of 

 upper surface of snout and upper eyelids pale brown ; limbs pale 

 l)ronzy brown, with small black spots or marblings, which are 

 confluent into longitudinal streaks on the sides of the tibia ; hinder 

 side of thighs black, spotted or marbled with white. Lower parts 

 white, uniform or spotted with brown. 



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

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

 the fore limb ; a large oval gland on the arm. 



