Key 



2. Leg long (length to heel equal to total length); ear obscure, covered 

 with tubercles; size small (2^ inches). Pacific region. 



Rana boylii. (See Colour Plate II, also p. 221.) 



II. Lateral folds not present; ear of male larger than eye; legs relatively short; 

 webs large. 



A. Webs quite to the tips of the toes; head long (two and a half times in 



total length); size large (4 to 5 inches). Southeastern United States. 

 Rana grylio. (See Fig. 269, also p. 226.) 



B. Webs leave one joint of fourth toe free; body stout. 



I. Head narrow; size medium. New York to Minnesota and Canada. 



Rana septentrionalis. (See p. 224.) 



a. Head broad; size very large (7 to 8 inches). Eastern North America. 

 Rana catesbiana. (See Fig. 276, also p. 227.) 



C. Webs shorter (two joints fourth toe free); head narrow, long; size 



small (2 J inches). New Jersey. 



Rana virgatipes. (See Colour Plate XIII, also p. 222.) 



SO 



