PLETHODONTID^. — LXXXIII. 193 



^ Premaxillaries united ; color yellow or red, spotted or striped. 



Spelerpes, 3. 

 ^X Premaxillaries 2^ color purplish gray or salmon color, un- 

 spotted. . . . . . . Gyrinophilus, 4. 



/. HEMIDACTYLIUM, Tschudi. Four -Toed Sala- 

 manders. 



1. H. scufafum, (Schl.) Tsch. Four - Toed Salaman- 

 der. Ashy brown above; snout yellow; silvery below, 

 with dots like ink spots; tail slender, nearly twice the 

 length of the body; head blunt. R. I. to Ills., and S. 

 (S. inelcoiosticta, Gibbes.) 



2. PLETHODON, Tschudi. Plethodonts. 



1. P. eryihronoius, (Green) Baird. Red -Backed 

 Salamander. Plumbeous above, often with a broad 

 red dorsal band; belly marbled; body very slender; tail 

 cylindric; inner toes rudimentary; costal folds 16 to 19. 

 E. U. S., common. [P. cinereus^ (Green) Cope, variety 

 without red dorsal band.] 



2. P. glutinosus, (Green) Baird. Viscid Salaman- 

 der. Black, usually with gray lateral blotches and 

 smaller dorsal spots; stout; tail rounded; inner toes well 

 developed. E. U. S., chiefly terrestrial, like the pre- 

 ceding:. 



'&■ 



3. SPELERPES, Raflnesque. Cave Salamanders. 



1. S. bilineatus, (Green) Baird. Two -Striped Sala- 

 iNiANDER. Yellow with a dark line along each side of 

 the back; belly unspotted; tail not keeled; costal folds 

 14; small. Maine to Wis. and S. 



2. S. longicaudus, (Green) Baird. Cave Salamander. 

 Lemon yellow; sides with many small black spots; a 

 median dorsal series; belly spotless; tail keeled, very 



9 



