114 PEOCEEDINGS OF THE ACADEMY OP 



— 3 ; 1 — 5 — 2 — 4 — 3 ; only three phalanges in longest toes. The tail is quite 

 slender, and only compressed at the tip ; in some there is a keel above on the 

 distal third, but never any dermal fin. 



The vomerine teeth are very few and small when present; they are often 

 wanting. Their basal line is on a ridge which is convex backwards, nearly 

 continuous medially. The parasphenoid teeth stand on two narrow plates 

 which are well separated, especially behind, and are shortened ; anteriorly 

 they only reach to near the middle of the orbits. The mandibular teeth pre- 

 sent peculiarities in the male, by which it may be readily distinguished from 

 the female. In a large number of specimens the oral commissure is but little 

 undulate, and the mandibular teeth, though longer medially, are continued to 

 near the basis of the coronoid process. The males exhibit a strongly flexuous 

 commissure, and the alveolar margin of the mandible is deeply concave below 

 the front of the orbit, and edentulous. The distal portion is abruptly convex 

 and armed with long teeth. The margin is slightly concave anterior to this 

 point, and finally rises again at the symphysis, which is prominent and pro- 

 tected externally by a pad of crypts as in D. fuse a. The structure of the 

 males is in the mandibular dentition quite that of the genus Anaides, the A. 

 ferreus m. presenting the characters but little more strongly. No such 

 sexual difference can be found in the D. fusca, though the commissure 

 only may be sometimes more flexuous in males. The jaws and dentition in the 

 D. ni gr a do not differ in the two sexes. 1 have observed that two of the 

 many males of D. ochrophaea, possess the female dentition. The tongue 

 in D. c h r o p h ffi a is an elongate oval, considerably free behind. 



The color of the females is a bright brownish yellow, fading to a dirty 

 white below, with a dark brown shade on each side from the eye to the end 

 of the tail which is darkest above, and gives the dorsal hue the character of a 

 band. There is an irregular series of brown dots along the vertebral line. 

 Males are rather longer and usually darker in color; thus the dorsal band is 

 brownish, the lateral bands blackish, and the dorsal spots more distinct, la 

 most specimens of both sexes there is a light band from the eye to the rictus 

 oris, and the belly is always immaculate, the gular region nearly always. The 

 testes and vas deferens are covered with black pigment; no pigment on the 

 peritonaeum of the female. 



This species scarcely attains half the size of the D. f u s c a, as indicated by 

 the numerous females with developed eggs in our collections. As the eggs 

 are equal in size to those of D. f u a c a when ready to be discharged, and as 

 the species is only half the size of the same, the eggs in the oviduct of a gra- 

 vid female at one time are only half as numerous. I have only found from 

 6 — 10 iu D. o c hr op h fB a, in each oviduct, while from 18 to 30 maybe 

 counted on one side in D. f u s c a. 



Measuremenls. 



Inches. 



Length (axial) from snout to rictus oris -2 



" " " axilla -46 



« " " groin .... 1-29 



" " " end vent 1-51 



" " " end tail 3-01 



" fore limb -3 



" " foot -08 



" hind limb -36 



" " foot -17 



"Width " " sole -8 



'' head at rictus oris -2 



" body at middle '22 



Jlabttat, etc. — This Salamander is chiefly abundant in the chain of the Alle- 

 ghenies and their outlying spurs ; I have never seen it in the hill country of 



[May, 



