The Inhabitants of the Aquarium 281 



ear, or sound plate. The color of the bull- 

 frog varies greatly. While on some, the 

 ground color of the back is a dusky olive 

 brown, mottled with darker blotches of the 



Fig. 114. Bull Frog, Rana catesbiana. 



same color, others show, generally on the 

 sides, a considerable amount of green. To- 

 ward the belly the color grows lighter, 

 changing into a yellowish white with sul- 

 phur yellow markings where the legs begin. 

 The Leopard, or Shad Frog (Rana vires- 



