176 VERTEBRATE ANIMALS OF THE UNITED STATES 



di Tail spotted with black; belly straw color, not irides- 

 cent; greatest length 145 mm Raiia catesbeiana. 



do Tail greenish, mottled with brown; belly cream 



color; greatest length 84 mm Raiia clatnitans. 



da Caudal crest very dark purpUsh black, mottled; 

 belly conspicuously iridescent; greatest length 

 74 mm Raiia palustris. 



dj Caudal crest very light, translucent, with a few 

 scattered dots; belly deep cream with a bronzy 

 iridescence; greatest length 84 mm Rana pipiens. 



