'BATRACHIANS OF THE VICINITY OF NEW VORK 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- 
Bull 
Frog. 
FIG. 26. THE BULL FROG 
From specimen in New York Zodélogical 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 
