2. EANA. 43 



tarsal tubercle. The hiud limb being earned 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-h, c. Hgr. Mexico. IM. SalI4 [C.]. 



d-e. Hgr. Vera Cruz. 



48. Rana nigricans. 



Rana nigricans, Hallow. Proc. Ac. Philad. 1854, p. 96 ; Boule-ng. Bull. 



Soc. Zool. Ft: 1880, p. 207 ; Brocclii, Miss. Sc. Mex., Batr. p. 15, 



pi. iv. f. 3. 

 ■^ Itana boylii, Baird, Proc. Ac. Philad. 1855, p. 62. 

 Rana longipes, Hallow. U. iS. J^.vpi. tsurv. x. i«o5:), iv. Zool. p. 20, 



pi. x. f. 1. 



Vomerine teeth in two nearly straight oval groups between the 

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

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

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

 toes moderate, not entirely webbed ; subartieular tubercles of fingers 

 and toes moderate ; inner metatarsal tubercle small, 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. 2 . Pacific Coast of N. America. 



c. Yg. California. 



49. Rana pretiosa. 



Rana pretiosa, Baird <*(• Gir. Proc. Ac. Philad. ISo.'j, p. .378; Baird, 

 Proc. Ac. Philad. 1855, p. 378 ; Gir. U. S. P.rpl, Exped., Herp. 

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

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



Vomerine teeth in two narrow oblique groups extending bej'ond 

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

 depressed ; snout moderate, rounded ; interorbital space not quite 

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

 the eye, rather distant from it. Fingers rather slender, pointed, 

 first extending beyond second ; toes incompletely webbed ; subarti- 

 eular tubercles of fingers and toes small ; inner metatarsal tubercle 

 small, Idunt : 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. 



