AMPHIBIANS 



1=^1 



,1. tigrinum (Green). Tiger salamander; axylotl (Fig. 68). Body 

 thick and massive, dark brown in color, with many large rounded 

 or irregular yellow spots which may be confluent; length 250 mm.; 

 tail 125 mm.; costal grooves 12; vomerine teeth in one long transverse 

 band: America east of the Rockies; Mexico; common, especially 



Fig. 68. — (Above) A^nbysloma tigrinum {from Fowler): (below) head, inside of mouth and 

 inner surface of feet of same {from Cope). 



in the west. The larva sometimes becomes sexually mature and breeds, 

 although it still has gills and lives in the water: it is then called an 

 axylotl, and was formerly supposed to be a distinct species and given 

 the name Siredon pisciformis Dumtnl . 



A. jefersoniamim (Green) (Fig. 69). Body long and slender, 

 brownish or blackish in color, with pale dots which may be wanting; 

 digits very long; no plantar tubercles, or a single indistinct one; length 

 150 mm.; tail 75 mm.; costal grooves 12: northeastern States and 

 Canada; northward to Hudson Bay; southward and westward to 

 Tennessee, southern Illinois and Arkansas; common northward. 



