1925] 
Storer: A Synopsis of the Amphibia of California 
267 
folds, conspicuous black spots on dorsal surface, and compact group- 
ing of vomerine teeth ; from Rana pretiosa ssp. and Rana aurora ssp., 
by absence of light line on upper lip, by more conspicuous and 
smoother tympanic membrane, by absence of black patch on side of 
head, and by absence of red in coloration of ventral surface ; from 
Rana catesbeiana by more slender form, presence of conspicuous 
dorsolateral folds, tympanic membrane smaller than orbit, and pres- 
ence of black spots on upper surface. 
Description (based on two adults from Imperial Valley and Colo- 
rado River). — Body slender, legs large; head very acutely oval in 
outline from above, pointed at tip, thin in profile, tip of muzzle 
slantingly rounded; external nares opening dor sally, about equi- 
distant from tip of snout and anterior border of orbit on distinct 
canthus rostralis; side of muzzle below canthus rostralis slanted out- 
ward to margin of upper jaw; orbit large; interorbital space very 
narrow, not one-half length of orbit ; tympanic membrane large, 
rounded, with distinct spot in center, diameter half (female) or two- 
thirds (male) of length of orbit; anterior border of tympanic mem- 
brane close to posterior margin of jaw ; lower jaw narrowly oval, over- 
hung at tip by upper jaw; fore limb moderate; exposed portion of 
upper arm shorter than forearm; palm short; two palmar tubercles, 
not conspicuous; sesamoid tubercles round; digits slender, pointed, 
third longest, first, second, and fourth subequal ; body slender ; dorso- 
lateral folds conspicuous ; hind limb very stout, tibia shorter than 
femur ; tarsus rounded, about one-third of length of whole foot ; foot 
slender; one inner elongate metatarsal tubercle; sesamoid tubercles 
oval; toes slender, tips not blunt, in order of decreasing length, 4, 3, 
5, 2, 1 ; web reaching to middle of penultimate phalanx of fourth toe. 
Tongue narrowly or broadly heart-shaped, pointed anteriorly, bi- 
lobed posteriorly, greatest width half (male) or two-thirds (female) 
width of mouth at angles of jaws, thicker in male than in female; 
maxillary teeth small, numerous, extending to angles of mouth ; 
internal nares large, widely spaced, close to margin of jaw ; vomerine 
teeth in two separate oval groups, between internal nares, convergent 
posteriorly. 
Measurements of Adult Specimens of Eana pipiens from California 
M.V.Z. 
No. 
Sex 
Head-and-body 
length 
Length of head 
Width of head 
Orbit 
Interorbital 
space 
Forearm 
Hand 
Femur 
Tibia 
Tarsus 
"o 
*2 
"o 
A 
£ 
1845 1 
9 
65.5 
24.4 
22.2 
9.0 
3.0 
15.2 
17.0 
31.2 
34.3 
18.2 
52 
1058 2 
c ? 
74.0 
26.1 
25.7 
9.0 
3.2 
19.0 
18.6 
36.0 
38.7 
20.1 
60 
6196 3 
cT 
64.0 
21.8 
20.4 
7.8 
2.3 
16.4 
16.9 
33.0 
35.4 
19.5 
57 
1 Colorado River near Riverside Mtn., Mar. 21, 1910. 
2 6 mi. w. Imperial, Imperial Co., May 6, 1909. 
3 Lake Tahoe (Placer Co.?), Sept., 1916. 
