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



193 



prominent, \ to ', the length of the inner toe ; outer tubercle small 

 and very indistinct, or absent. 



Skin smooth or finely granulate above ; dorso-lateral fold 

 absent or distinct only anteriorly ; a glandular fold from below 

 the eye to the shoulder, broken up behind; lower parts smooth, 

 feebly granulate on the posterior part of the belly and of the 

 thighs. 



Brown or dark grey above, with small darker spots, flanks 

 lighter, usually with black spots ; a dark canthal streak and a dark 

 temporal blotch ; tympanum reddish brown ; a whitish streak along 

 the upper lip; limbs with rather indistinct dark cross-bands; 

 hinder side of thighs yellowish, with black spots or marblings. 

 Lower parts white. 



Males with a large external vocal sac on each side of the 

 throat in front of the arm ; fore limb strong ; a thick pad on the 

 inner side of the first finger. 



Nasal bones rather small, separated from each other ; ethmoid 

 largely exposed above, pointed in front, extending to between the 

 nasals. 



Eggs not pigmented, 3 millim. in diameter. 



Measurements, in millimetres. 



1-2. Bangkimtsing (types). 3-5. Kosempo. 



Habitat. Formosa. 



105. Rana cavitympanum. 



Rana cavitympanum, Bouletig. Proc. Zool. Soc. 1893, p. 525, pi. xliii, 

 fig. I. 



Vomerine teeth in short slightly oblique series between the 

 choante, nearer to each other than to the latter. 



Head as long as broad, much depressed ; snout rounded, 

 scarcely projecting beyond the mouth, a little shorter than the 



