AMPHIBIANS AND REPTILES. 55 
Also 4 others, all smaller, with same data. ‘This little sala- 
mander is found in the northern or upland portions of our state, 
and is entirely terrestrial. The only examples I have seen were 
those taken by Mr. S. N. Rhoads. They were found under logs. 
Dr. Dahlgren tells me this species was very common in the vicin- 
ity of Princeton, and that he has secured as many as 50 indi- 
viduals. 
Hemidactylium scutatum Sherwood, Proc. Linn. Soc. N. Y., 
1895-96, No. 7, p. 30.—Stone, Am. Nat., XL, 1906, p. 160. 
Genus PLETHODON Bonaparte. 
The Slimy Salamanders. 
Key to the species. 
a. Form slender; vomerine teeth not extending beyond nares externally; 
costal grooves 16 to 19; tail cylindrical; limbs weak; inner toes rudi- 
mental; belly brown marbled; above plumbeous or with a red longi- 
tudinal band. ERYTHRONOTUS 
aa. Form stout; vomerine teeth extending outside of inner nares; costal 
grooves 14; tail rounded; limbs short, stout; inner toes distinct; black, 
usually with gray lateral blotches and smaller dorsal spots. GLUTINOSUS 
Plethodon erythronotus (Green). 
PLATE 9. 
Red Backed Salamander. Dapple Salamander. 
Gray Salamander. 
(| 
Red Backed Salamander. Plethodon erythronotus (Green). 
Head 9%; depth 14; width of head 1% in its length from 
snout to gular fold; length of mouth 14; interorbital space, 
measured from eye-sockets, 5; width of mouth 134; fore limb 
about 114; hind limb a trifle more than head; head and trunk 
a trifle more than tail measured from just behind vent. Body 
