2. RANA. 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. Her. Mexico. M. Sallé [C.]. 
d-e, Her. Vera Cruz. 
48, Rana nigricans. 
Rana nigricans, Hallow. Proc. Ac. Philad. 1854, p. 96 ; Bouleng. Bull. 
we oa Fr. 1880, p. 207 ; Brocchi, Miss. Sc. Mex., Batr. p. 16, 
; iv. £: 8. 
Bana boylii, Baird, Proc. Ac. Philad. 1855, p. 62. 
Rana longipes, Hallow. U. S. Expl. Surv. x. 1859, iv. Zool. p. 20, 
ple tak: 
Vomerine teeth in two nearly straight oval groups between the 
choanee. 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 ; subarticular 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 aboye, 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_b. 2. Pacific Coast of N. America, 
Cae. California. 
49. Rana pretiosa. 
Rana pretiosa, Baird §& Gir. Proc. Ac. Philad, 1853, p. 378; Baird, 
Proc, Ac. Plalad, 1855, p. 378; Gir. U.S. Expl, Exped., Herp. 
p- 20, pl. 2. ff. 18-18; Cooper, U.S. Expl. Surv. xii. part ii. p. 804; 
Bouleng. Bull. Soc. Zool. Fr. 1880, p. 208. 
Vomerine teeth in two narrow oblique groups extending beyond 
the level of the hinder edge of the choane. . 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. Fingers 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, 
