2. KANA. 43 



tarsal tubercle. The hind limb being carried forwards along the 

 body, the tibio-tarsal articulation reaches the tip of the snout, or a 

 little beyond. , A narrow glandular lateral fold. Brown above, with 

 round dark spots ; a dark temporal spot. 

 California ; Mexico. 



a-b, c. Hgr. Mexico. M. Sall6 [0.]. 



d-e. Hgr. Vera Cruz. 



48. Raua nigricans. 



Rana nigricans, Hallow. Proc. Ac. Philad. 1854, p. 96 ; Bovleng. Bull. 



Soc. Zool. Fr. 1880, p. 207 ; Brocchi, Miss. So. Max., Batr. p. 15, 



pi. iv. f. 3. 

 ? Rana boylii, Baird, Proo. Ac. Philad. 1856, p. 62. 

 Rana longipes, Hallow. U. 8. Expl. Surv. x. 1859, iv. Zool. p. 20, 



pi. X. f. 1. 



Vomerine 'teeth in two nearly straight oval groups between the 

 choanoB. Head moderate ; snout short, rounded ; interorbital space 

 at least as broad as the upper eyelid ; tympanum distinct, two thirds 

 the size of the eye. Engers moderate, first extending beyond second ; 

 toes moderate, not entirely webbed ; subarticular tubercles of fingers 

 and toes moderate; inner metatarsal tubercle smaU, blunt; outer 

 tubercle none, or obtuse. The hind limb being stretched forwards 

 along the body, the tibio-tarsal articulation reaches the eye, or a 

 little beyond. Glandular lateral folds not prominent (in the adult), 

 much further apart than in Rana fusca. Dark brown above, with 

 small darker spots ; legs barred across ; beneath either whitish, 

 scarcely or not spotted, or greyish brown, vermiculated with whitish; 

 hinder side of thighs blackish, white-marbled. Large species. 



W. N. America. 



a-h. 5 . Pacific Coast of N. America, 



c. Yg. California. 



49. Hana pretiosa. 



Rana pretiosa, Baird Sr Gir. Proc. Ac. Philad. 1853, p. 378 ; Baird, 

 Proc. Ac. Philad. 1855, p. 378 ; Gir. U. 8. Expl, Exped., Herp. 

 p. 20, pi. 2. S. 13-18 ; Cooper, U. 8. Expl. Surv. xii. part ii. p. 304; 

 Bouleny. Bull. Soc. Zool. Fr. 1880, p. 208. 



Vomerine teeth in two narrow oblique groups extending beyond 

 the level of the hinder edge of the choanse. Head moderate, rather 

 depressed ; snout moderate, rounded ; interorbital space not quite 

 so broad as the upper eyelid ; tympanum two thirds the diameter of 

 the eye, rather distant from' it. Pingers rather slender, pointed, 

 first extending beyond second ; toes incompletely webbed ; subarti- 

 cular tubercles of fingers and toes small ; inner metatarsal tubercle 

 small, blunt ; a small, conical, very prominent tubercle at the base 

 of the fourth toe. The hind limb being carried forwards along the 

 body, the tibio-tarsal articulation does not reach the tip of the snout. 

 Grandular lateral fold not very prominent. Greyish brown above, 



