Plate III. Tadpoles, i 

 Florida tree frog (xi). 2, 3 

 Hammond's spadefoot (xf) 

 4. Cricket frog (xi). 5 

 Narrow-mouthed toad (xi) 

 6. Mouthparts of narrow- 

 mouthed toad (X4). 7- Toad 

 (Xi). 8. Mouthparts of bell 

 toad (after Gaige) (X2): 9. 

 Mouthparts of gopher frog 

 (X4). 10. Mouthparts of soli- 

 tary spadefoot (X4). 



Tadpoles. Some twenty- 

 five species of tadpoles of the 

 United States and Canada 

 need to be described. About 

 ten of these have been found 

 but were not described, and 

 the tadpoles of fifteen forms 

 are yet unknown to science. 

 The life histories of the rob- 

 ber frogs we know in our 

 country indicate no free tad- 

 pole stage, the whole de- 

 velopment being in the egg. 



In discussing the size of 

 tadpoles in previous publica- 

 tions and in this work we 

 consider quite small to be 

 1 inch (24 mm.) or smaller, 



small to be 1-1 2/5 inches 

 (24-35 mm.), medium, 1 3/5- 

 2 inches (40-50 mm.), large, 

 2 2/5-3 2/5 inches (60-86 

 mm.), quite large, 3 4/5-4 

 inches (95-100 mm.), very 

 large, 5 2/5-5 4/5 inches 

 (135-145 mm.). Some of the 

 toads and swamp cricket frogs 

 may have tadpoles a little less 

 than 1 inch (23 or 24 mm.) 

 while bullfrogs may have tad- 

 poles 5 4/5 inches (145 mm.) 

 or even larger. 



The tadpole has a body and a tail. The body has sensory lines, a 

 breathing pore or spiracle, a vent or anus, eyes, nostrils, and a 



SrS 



