320 Illinois Stale Laboratory of Natural History. 



of the eye over the tympanum and downward behind the latter 

 to the glandular fold of the side of the head. Head above 

 with three dark spots, of which the anterior is smallest and is 

 commonly minute. Between the bright yellow glandular folds 

 of the sides of the back are two longitudinal series of squarish 

 black or brown spots, sometimes united so as to form two 

 wide longitudinal bands. Below the glandular fold of each 

 side is another series of large dark spots, and still lower 

 down on the sides are a few large spots and several 

 smaller round spots. Anterior legs like the back above, with a 

 dark dash at the base of the humeri and with a few other 

 dark spots elsewhere; sometimes with a dark band along the 

 posterior surface. Posterior legs banded and spotted with 

 brown or black above, with the posterior surface of the femora 

 marbled with black or with numerous small round spots. A 

 black band extends along the posterior surface of the tibia. 

 Lower lip more or less speckled with dark spots. 



Length of body, 2-2.62; from tip of snout to axilla, .97- 

 1.25; femur, .94-1.37; tibia, 1.03-1.50; tarsus and fourth toe, 

 1.37-2.06. 



Wabash Valley (Ridgway), Bluff Lake in Union Co. 



This species has been reported common throughout the 

 State, but it is far from being so. It does not occur at all on 

 the prairies of central Illinois, and it is doubtful if it is common 

 anywhere within our limits. Two fine examples were taken 

 in southern Illinois in the summer of 1883, and are the only 

 ones taken during many years' collecting. These specimens 

 differ from typical forms of the species from the East in 

 several particulars. The spots are black and most of those of 

 the two median series of the back are united so as to form 

 two wide longitudinal bands. The entire throat back to the 

 anterior limbs is obscurely marbled with dusky. The species 

 bears a general resemblance to B. pipiens, but it is to be readily 

 separated from the latter by the arcuate outline of the sides of 

 the head, by the form of the spots, and by the wide depressed 

 glandular folds. It will average smaller than R. pipiens. The 

 males do possess vocal sacs, and in precisely the same situation 

 as in males of the other species. The habits are much the same 

 as those of the leopard frog. This species breeds a little earlier, 



