General Discussion 25 



24 mm., and for females at 20.5-23 mm. The third group of Umr—Hyla 

 andersonii, Hyla versicolor, Hyla cinerea, Rana virgatipes, matures for males 

 at 30-41 mm., for females at 38-41 mm. The fourth group of six species, viz: 

 Rana septentrionalis, Hyla gratiosa, Rana sphenocephala, Bufo terrestris, 

 Rana clamitans and Scaphiopus holbrookii matures for males at 48-54 mm. 

 and for females at 48-56 mm. The fifth group has one form, Rana aesopus, 

 with first males at 68 mm. and first females at 77 mm. The final and sixth 

 group comprise Rana heckscheri, Rana grylio and Rana catesbeiana with 

 males maturing at 82-85 mm. and females, at 85-102 mm. The above data 

 and more are summarized in the following table: (Table 10) 



The relationship of egg diameter to smallest breeding size in each species 

 is given in the following table (Table 1 1). With the smallest and largest egg 

 vitelline diameters we divided the least breeding size of each species to see how 

 many times bigger the body length was than the real egg diameter of each spe- 

 cies. For example the smallest breeding oak toad in body length is only 13.6 

 times longer than the egg diameter of that species, wherein the smallest breed- 

 ing bullfrog would be 50 times longer in body length than its own egg. 



The five smallest species have relatively the largest egg vitelli, 13. 6-1 5 

 times in body length. The bulk of the species (15 in number) have vitelU in 

 body length from 17.5-30 times. Rana grylio has it 41 times and Rana 

 catesbeiana has it 50 times. 



