The tiger salamander, Ambystoma tigrinum, natural size. The figure at the top is a mid- 

 western adult form, after G. K. Noble ('31, by permission of the McGraw-Hill Book Co.). 

 Below this is a photograph of a midlarval stage by Professor S. H. Bishop. The two lower 

 figures show late larval and adult stages of the eastern form, the adult with brilliant yellow 

 "tiger" stripes. (Courtesy of the American Museum of Natural History.) 



