66 STORY OF THE AMPHIBIANS 



To know such as the reader is apt to meet in the Northeastern 

 United States the following may be helpful : 



A. Teeth absent from upper jaw. 



B. Skin warty, toes webbed. Common Toad. 

 BB. Skin smooth, toes free. {TootJdess Frogs'^.) 



AA. Teeth present in upper jaw. 



C. Fingers and toes ivitJi slight dilatations or pads at tips. 



(Hylida?, our) Tree-toads. 

 D. Webs absent on fingers ; pads mere dots. 



E. Brownish above ; head green. " Cricket Frog.^^ 

 EE. Grayish above ; no green or brownish. 



Sit'amp Tree-toad. 

 DD. Webs present on fingers ; pads large, shotlike. 

 E. Greenish above. 



G. The green has a yellowish or olive cast ; some 

 spots on back (as well as the sides). 



Hyla squirrella. 

 GG. The green pure — pea green ; no spots on back. 

 Green Tree-toad. Hyla andersonii. 

 EE. Not greenish above ; yellowish drab or dusk-colored. 

 PicTxering's Tree-toad, Hyla piclieringii. 

 CC. Fingers and toes not dilated or padded at tijjs: they end in 

 sharp points. {Rana) 



H. Spots on the back squarish, their edges or outlines nearly 

 straight. 



I. Back greenish; spots not in straight rows; thighs with 



three broad bars. Leopard Frog. 



II. Back brownish; spots rectangular, in rows; those on 



thigh not forming broad bars. PicA-erel Frog. 



HH. Spots on back not squarish ; either round dots or 

 irregular blotches. 

 K. Web of feet not reaching the tip of the fourth 



toe. Gree7i Frog or Spring Frog. 



KK. Web of feet reaching tip of fourth toe. 



Bullfrog. 



Other frogs are found in our region, but they are not so com- 

 mon as these. 



