2. RANA. 37 



Vomerine teeth in two small oblique groups close together, ex- 

 tending a little beyond the hinder edge of the choanse. Head 

 moderate ; snout rounded, with distinct canthus rostralis ; interorbital 

 space half the width of the upper eyelid or rather more ; tympanum 

 at least as large as the eye, sometimes nearly twice as large, gene- 

 rally larger in males than in females. Fingers with blunt tips, 

 first not extending beyond the second ; toes not webbed to the tips ; 

 subarticular tubercles of fingers and toes moderate ; a single, small 

 metatarsal tubercle. The hind limb beiag carried forwards along 

 the body, the tibio-tarsal articulation reaches nearly the tip of the 

 snout. A prominent, narrow, glandular lateral fold, at least on the 

 front half of the back. Brown or olive above, more or less spotted 

 or marbled with blackish ; beneath, immaculate or marbled with 

 grey. Male with two internal vocal sacs. 



E. ]Sr. America. 



87. Bana septeutrioualis. 



Rana septentrionalis, Baird, Proc. Ac. Philad. 1855, p. 61. 

 sinuata, Baird, I, c. 



Vomerine teeth smaU, between the choanae. Habit stout. Tym- 

 panum three fourths the size of the eye. Toes not quite entirely 

 webbed. Skin porous ; a broad, depressed, glandular lateral fold ; 

 a branch of same round the tympanum ; beneath with scattered 

 glandules. Above olive or brown, with lighter vermiculations, and 

 with a few large dark blotches posteriorly ; beneath immaculate. 



Canada to Montana. 



Xjy^S. Rana plancyi. 



? Eana trivittata. Hallow. Proc. Ac. Philad. 1860, p. 505. 

 Eana plancyi, Lataste, Le Naturaliste, 1880, p. 210, and Bvll. Soc. 

 Zool. Fr. 1880, p. 64. 



Vomerine teeth in two slightly oblique groups extending a little 

 beyond the hinder edge of the choanae. Snout a little shorter than 

 in R. esculenta ; tympanum as large as the eye, close to it. Fingers 

 more slender, pointed ; subarticular tubercles of fingers and toes 

 little developed ; inner -metatarsal tubercle strong, cornpressed, rather 

 more than half the length of the first toe. Glandular lateral fold 

 very much developed, as broad as the upper eyelid. Greyish or 

 olive above, uniform or with indistinct dark spots ; seldom a light 

 vertebral line ; a blackish band along the hinder side of the 

 thighs ; a similar one, sometimes indistinct, along each side of the 



