AMPHIBIANS 175 



of egg laying middle of June to middle of July; 

 no individual jelly envelope to egg; number of 



eggs 12,000 to 20,000 Rana catesbeiana. 



C2 Eggs laid in small bunches or singly. 



di Egg with 2 jelly envelopes, the inner one distinct; 

 vegital pole of egg yellowish or cream; eggs 

 laid in small bunches (4 to 25) on surface of 

 water either attached or free; season of egg 

 laying middle of ]\Iay to middle of June; num- 

 ber of eggs 1,500 to 2,000 Ilyla versicolor. 



do Egg with but one jelly envelope; vegital pole of 



egg white. 



ei Eggs laid in bunches (20 to 100) attached to 



sticks and grass beneath the surface of the 



water; season of egg laying middle of March 



to middle of April; number of eggs 500 to 



800 Pseudacris triseriatus. 



en Eggs laid singly or in small bunches (4 to 12) 

 attached to grass beneath the surface of the 

 water; season of egg laying middle of March 

 to May; number of eggs 800 to 1,000 Hyla crucifer. 



In the identification of the well-grovv^n tadpoles the features to be 

 first noticed are the relative size and color of the body and the relative 

 size and color of the tail. The position of the spiracle, through which 

 the respiratory water is discharged, the position of the anus and the 

 number of rows of labial teeth, which are situated above and below the 

 mouth, are also important. 



Key to the Tadpoles of some of the common Eastern Frogs and Toads 



ai Anus median; spiracle sinistral; tail cloudy, translucent, 

 rounded at the end; belly very dark, iridescent; greatest 



length 28 mm Biifo amerkanus. 



aa Anus dextral; spiracle sinistral; greatest length over 30 mm. 

 bi Eyes lateral in position, being visible from the ventral as 

 well as from the dorsal aspect of the body; upper caudal 

 crest extends almost to the eyes. 

 Ci Tail covered with black blotches and scarlet or ver- 



mihon in color; belly white Hyla versicolor. 



c-i Tail heavily pigmented with black blotches on the outer 



edges; belly cream, iridescent Hyla crucifer. 



bo Eyes dorsal in position; upper caudal crest not extending 

 be>'ond the spiracle. 

 Ci Labial teeth, 3 or 4 rows above the mouth and 4 rows 

 below it; a creamy line along the upper jaw region; 



belly pinkish; greatest length 47 mm Rana sylvatica. 



C2 Labial teeth, 2 or 3 rows above the mouth and 3 rows 

 below it. 



