A KEY TO THE EGGS OF ANURA. 7 1 



single or in small bunches (4-12) attached to grass beneath the sur- 

 face of the water; vitellus, .9-1.1 mm. Egg complement, 800- 



1,000. Season, April 5-May 10 Hyla pickeringii. 



CC. In large loose masses ; vegetative pole vyhite ; animal pole black ; 

 vitellus, 1. 2-1. 7 mm.; at or near the surface of the water. 



D. Usually one continuous film, 1-2 eggs thick, on the surface of the 

 water, the film's diameter being seldom i foot; inner envelope dis- 

 tinct, 2.8-4.0 mm. ; egg mass usually attached or amongst vegetation. 

 Egg complement, 3,500-4,500. Season, May 25-August 10. 



Rana clamitans, 



DD. Either a film 1-2^ feet in diameter or a stringy frayed widespread 



mass; attached to twigs or sticks; almost invariably amongst brush 



and at or near the surface of the water ; no inner envelope. Egg 



complement, 12,000-20,000. Season, June 20-July 25. 



Rana catesbeiana. 



