1920.] G. A. BouLENGER : Frogs of the Genus Rana. 57 



Measurements in millivielres. 



From snout to vent . . 



Head 



Width of head 



Snout 



Eye 



Interorbital width 



Tympanum 



Fore limb . . 



First finger 



Second finger 



Third finger 



Fourth finger 



Hind Hmb . . 



Tibia 



Foot 



Third toe . . 



Fourth toe 



Fifth toe . . 



1—2. N. of Utradit, N. Siam. 3. Nal 

 Upper Burma. 5. Tenasserim. 



Habitat. Tenasserim, Upper Burma. Siam. 



Very closely allied to R. hascheana, from which it is distin- 

 guished by the larger and more prominent inner metatarsal tuber- 

 cle and by the presence of tooth-like prominences in front of the 

 lower jaw as well as of vocal sacs in the males. 



21. Rana microdisca. 



Rana microdisca, Boettg-., Ber- Offenb. Ver. Nat. 1892, p. 137; F. Miill., 



Verh. Nat. Ges. Basel. X, 1894, p. 839; Boettg". in Semon, Zool. 



Forscli. Austral. V, p. 113, pi. v, fig. 2 (1894); Bouleng., Ann. Mus. 



Genova (2) XIV, 1894, p. 616, Proc. Zool. Soc. 1897, p. 230, and Ann. 



and Mag. N.H. (6) XIX, 1897, p. 508; Van Kampen, Zool. Jalirb., 



Syst. XXII, 1905, p. 702. 

 Rana leytensis, Boettg., Zool. Anz. 1893, p. 365; Bouleng., Proc. Zool. 



Soc, 1897, p. 229. 



Vomerine teeth in moderately long or rather short, strong, 

 oblique series originating between the choanae and extending be- 

 yond the level of their posterior borders, or entirely behind them. 

 Bony prominences in front of lower jaw barely indicated in females, 

 rather small and pointed in males. 



Head moderate, moderately depressed, as long as broad or a 

 little broader than long ; snout rounded, scarcely projecting beyond 

 the mouth, as long ss the eye; canthus rostralis distinct; loreal 

 region moderately or feebly oblique, concave; nostril equidistant 

 from the eye and from the end of the snout or a little nearer the 

 latter ; the distance between the nostrils equal to or greater than the 

 interorbital width, which is equal to or less than that of the upper 

 eyelid; tympanum distinct, 1 to i the diameter of the eye and 

 li to 3 times its distance from the latter. 



Fingers moderate, the tips swollen or dilated into very small 

 discs, first as long as or a little longer than the second, third as long 

 as or a little longer than the snout ; subarticular tubercles moderate. 



