372 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Fore legs. Two tubercles on the palm. One prominent tubercle 
on the first and second digits. Two tubercles on the third and 
fourth digits: First finger slightly longer than second and 
fourth, which are equal. Third finger one third longer than the 
second. 
Ilind legs. Posterior ventral sides of femur only granulated. 
Web, including nearly the whole of the second digit, deeply 
incurved. A large tubercle on the inner side of the foot and on 
the under sides of the digital joints. Legs not so long or so slen¬ 
der as in R. silvatica. Tibia one half the length of the body. 
Distal joint of the tibia reaching not quite to the snout. First toe 
equal the first joint of the second. Second toe reaching half way 
up to the second joint of the third toe. Third reaching nearly to 
the third joint of the fourth toe. Fourth longest. Fifth reaching 
to third joint of the third toe. 
Color. — Dorsal surfaces. Dark brown to pale yellowish gray. 
Head with a dark vitta through the eye, on each side behind the 
eye including the tympanum and extending forward as a line from 
the corner of the eye through the nares to the end of the snout. 
A light line extends from the end of the snout to a point above the 
axilla. Other parts of the head more or less marked, with darker. 
A light median dorsal line from near snout to anus sometimes 
present. Body between lateral folds, varying from almost unicolor 
to distinctly marked with darker. Lateral folds somewhat lighter 
and bordered by a dark streak. Sides in many cases heavily 
spotted. 
Fore legs. A dark mark on anterior edge of humerus. Spotted 
more or less with irregular markings. 
Hind legs. Barred, but sometimes irregularly spotted with 
darker. 
Ventral surfaces. Pale grayish yellow, faintly mottled , except 
on hind legs. 
Hind legs. Yellowish. 
The distribution of this species, so far as known, extends from 
Illin ois and Minnesota northward probably to the region of Great 
Slave Lake, Can., and eastward to St. James Bay, Can. Professor 
Cope included four specimens from western Missouri in his locality 
list of Rana cantabrigensis in Bull. 34, IT. S. nat. mus. He 
made an error in his identification, however, for the specimens 
(3457) are without doubt the western form of Rana pipiens. 
