AMPHIBIANS 187 



belly pinkish; greatest length 47 mm Ra)ia sylvatica. 



d Labial teeth, 2 or 3 rows above the mouth and 3 rows 

 below it. 

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

 cent; greatest length 145 mm Rana catesbeiana. 



d2 Tail greenish, mottled with brown; beUy cream 



color; greatest length 84 mm Raua claniitans. 



ds Caudal crest very dark purplish black, mottled; 

 belly conspicuously iridescent; greatest length 



74 mm Rana paliistris. 



di Caudal crest very light, translucent, with a few 

 scattered dots; beUy deep cream with a bronzy 

 iridescence; greatest length 84 mm Rana pipiens. 



