192 BATRACHIANS. 



/. DESMOGNATHUS, Baird. DUSKY SALAMANDERS. 



1. D. ochrophoaa, Cope. YELLOW DESMOGNATH. 

 Brownish yellow with a brown shade on each side; a 

 yellowish dorsal band; back with a few spots; belly 

 unspotted; tail rounded; $ with lower jaw toothless 

 behind; costal folds 14; size small; scarcely aquatic. 

 Allegany Mountains, N. Y., southward. 



2. D. iusca, (Raf.) Baird. DUSKY SALAMANDER. 

 Brown above, with gray or purplish spots or shades, 

 becoming blackish with age; marbled below; eyes 

 prominent; tail compressed and keeled, as long as head 

 and body; costal folds 14; larger. Mass, to Ohio and 

 S.; one of the commonest species in springs and brooks; 

 remarkable for its activity and strength. 



3. D. nigra, (Green) Baird. BLACK SALAMANDER. 

 Uniform black; tips of tail, jaws, etc., brown; tail com- 

 pressed and finned; costal folds 12. Penn., S. in the 

 mountain springs; the largest Eastern Salamander. 



FAMILY LXXXIIL PLETHODONTID^l. 



(The American Salamanders.) 



Vertebras amphiccelian ; carpus and tarsus cartilagin- 

 ous. Various other distinctive characters are given by 

 Prof. Cope, but we omit them here as not available for 

 our present purpose. Genera eleven; species thirty; 

 nearly all North American. 



* The tongue attached by a hand running from its central or 



posterior pedicel to the anterior margin ; premaxillariea 2 . 

 f Toes 4r4, small, ashy above, spotted below. 



HEMTDACTYLrUM, 1. 



ft Toes 4-5 ; colors dark ; spotted or banded. PLETHODON, 2. 

 ** Tongue free all around, attached by its central pedicel only; 

 toes 4-5, all free. 



