66 STORY OF THE AMPHIBIANS 



To know such as the reader is apt to meet in tlie 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. (Toothless Frogsl) 



AA. Teeth present in upper jaw. 



C. Fmgers and toes ivith slight dilatations or 2Jads at tips. 



(Hylida% our) Tree-toads. 

 D. Webs absent on fingers ; pads mere dots. 



E. Brownish above : head green. " Cricliet Frog."'' 

 EE. Grayish above ; no green or brownish. 



S'wamp 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. 

 Pickering's Tree-toad. Hyla piclxeringii. 

 CC. Fingers and toes not dilated or j^added at tips; they end in 

 sharp points. {Rana.) 



H. Spots on the back sqnarish, 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. Pickerel 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. Green Frog or Spring Frog. 



KK. Web of feet reaching tip of fourth toe. 



Bill I frog. 

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

 mon as these. 



