158 VERTEBRATE ANIMALS OF THE UNITED STATES 



di Back red or chestnut P. youahlossee. 



hi Color uniformiy plumbeous. 



Ci Body without color markings. 



di Belly mottled; costal grooves 19 P. clucreus. 



d2 Belly plain. 



Ci Costal grooves 14 P. metcalfi. 



62 Costal grooves 17 P. wehrlei. 



C2 Body with color markings. 



di Legs red P. shcrmani. 



d-i With a yellow stripe from eye to gular fold P. jordani. 



a2 Species occurring on the Pacific slope, 

 bi Digits not webbed. 



Ci Costal grooves 14 P. intermedins. 



Co Costal grooves 16 P. clongatus. 



bn Digits webbed; costal grooves 12 or 13 P. vandykei. 



P. cinereus (Green). Red-backed salamander; dusky salamander 

 (Fig. 74). Body very slender, cylindrical and elongate, and dark brown 



Fig. 74. — Plethodon cinereus {from Fowler). 



or dark gray in color with a broad, light reddish stripe running down the 

 back, which is sometimes wanting, there being thus two distinct color 

 phases; under parts mottled; length 90 mm.; tail 45 mm.; costal grooves 

 19; vomerine teeth not extending laterally beyond the inner nares: 



Fig. 75. — The roof of the mouth of Plelhodon glulinosus (from Dunn). 



Canada and States east of the Mississippi; Missouri and Arkansas; 

 very common towards the north; both larvae and adults terrestrial. 



P. dorsalis Cope. Similar to P. cinereus but with 17 costal grooves, 

 and a zigzag dorsal stripe: southern portions of Ohio, Indiana and 

 Illinois to Alabama. 



P. glulinosus (Green) (Fig. 75). Body rather stout, depressed, 

 blackish in color with whitish blotches and dots; length 138 mm.; 



