188 BATRACHIANS. 



between eyes; legs barred above; belly pearly or yel- 

 lowish, each side of back with a well-marked fold. N. 

 Am., the commonest species. 



2. R. palustris, Le Conte. PICKEREL FROG. Brownish 

 with the spots square, in four rows; young golden green; 

 body with two glandular folds on each side; slender. E. 

 U.S. 



** Back with small dark spots or none. 



3. R. clamitans, Merrem. GREEN FROG. SPRING 

 FROG. Bright green, darker on the flanks, every where 

 spotted with blackish; color sometimes rather brown 

 than green; white below; glandular folds conspicuous, 

 size moderate, U. S., E. of the mountains. (7t. horico- 

 nensis, Holbr. ll.fontinalis^ LeC.) 



4. R. catesbiana, Shaw. BULL FROG. Greenish, of 

 varying shades, with numerous small, indistinct darker 

 spots, head usually of a very bright pale green; glandu- 

 lar folds little marked; very large, a foot or more long 

 when adult. E. U. S., common; well noted for its rich 

 bass notes. (7?. pipiens, Auct., not of L.) 



5. R. silvatica, Le Conte. WOOD FROG. Color red- 

 dish brown ; a dark band on each side of the head 

 through eye and ear; quite small. E. U. S. common; 

 scarcely aquatic. (R. cantabrigensis, Baird, the Cam- 

 bridge frog, from E. Mass., N. and W. is another variety 

 of this species.) (See Addenda.) 



FAMILY LXXVIIL SCAPHIOPID^ 



(The Spade Foots.} 



Terrestrial frogs having the heel provided with a more 



or less developed spur. Genera three; species ten or 



more. In Europe, America, and Australia. 



* Toes completely webbed; forehead and crown bony, rough; 



skin slightly lubcrculate. . SCAPIIIOPUS, 1. 



