THE AMPHIBIA OF OKLAHOMA 

 TABLE III 



Lengths of B. cognattis individuals from a population metamorphosing during the 

 week previous to May 24, 1941. 



* Data not used in the computation of the growth curve in Fig. 2. 



Fig. 1. Breeding sites and collection areas near Norman, Olclahoma. 



Fig. 2 Growth of Btifo cognatiis. 



The upper Hne indicates mean length plus standard deviation and the lower mean 

 length minus standard deviation. Beginning at September 4, lengths of males and 

 females are indicated separately, the former being represented by heavier lines. The 

 crosses mark points on the curve drawn according to the formula given in the text. 



Literature Cited 



Bragg, Arthur N. 1940. Observations on the ccologs and natural history of ,A.nura. 1. Habits, 

 habitat, and breeding of Bttjo cognattis Say. Amer. Nat. 74: 322-349, 424-438. 



. 1942. On toad and frog abundance after heavy rainfall. Science, 95: 194—195. 



Bragg, Arthur N., and A. O. Weese. 1942. Growth rates and age at sexual maturity of 

 young toads (Bttjo cognattis) under natural conditions in central Oklahoma. (Abst.) 

 Bull. Ecol. Soc. Amer. 24(4): 69. 



Dickinson, E. 1913. The Frog Book. New York. Doublcday, Page and Company. 



58 



