BATRACHIANS OF THE VICINITY OF NEW YORK 203 



confined in indoor aquaria are much retarded in their growth, 

 and many remain as such for a period of three years or more. 



The Bull Frog, Rana catesbiana Shaw (Fig. 26), is very large 

 and stout. Limbs short but powerful. Hind feet large and 

 very fully webbed. Head wide. Color above, light 

 olive, irregularly blotched or marbled with dark olive " 



or brown. The intensity of these markings varies with 

 individuals and the disposition of the individuals themselves. 

 Limbs, especially the hind pair, with brown blotches which to- 



FIQ. 26- THE BULL FROG 

 From specimen in New York Zoological Park 



ward the extremities assume the form of bands. The under 

 parts are silvery white, with grayish markings, the throat in 

 many individuals assuming a yellowish tinge. The portion of 

 the head between the mouth and the eyes is usually tinged with 

 pale green; the upper surface, however, matches the general 

 color of the body. 



Half-grown specimens resemble the adult of the Pond Frog, 

 but may be recognized by the absence of the vein-like fold of 



[49] 



