408 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



son County, Tennessee; Edmondson County, Kentucky; and Normal, 

 Illinois. 



It occurs as far up the French Broad River as AsheviUe, but is not 

 otherwise known from the mountains of North Carolina. 



Diagnosis. — Vomerine teeth lost in male on attainment of sexual 

 maturity. Parasphenoids never confluent. Appressed toes sepa- 

 rated by four intercostal spaces. Tail keeled above. A distinct 

 color pattern. BeUy mottled, light. No row of light spots on sides. 

 Larvae : total length to 44 mm. Transformed specimens : Total length 

 29-100 mm., females, 128 mm., males; head and body 20-67 mm., 

 males, 52 mm., females.^ 



Description. — Vomerine teeth always present in females; lost in 

 males at sexual maturity. They form two arched series, which, 

 when complete, are composed of five to six teeth. The series is 

 separated by one and a half its length from the parasphenoids. They 

 do not extend beyond the nares, but approach each other within 

 one-fourth their own length. 



The parasphenoid teeth form two rather short, thick, completely 

 separated series. 



The tail in the adult is trigonal in cross-section near the base, the 

 distal half has a dorsal keel which is a simple fold of skin. This 

 sometimes extends to the anus but usually only in yoimg specimens. 



The tail is larger in females than in males. In a series of 23 females 

 from Haverford, Pennsylvania, 5 had the tail longer than the head 

 and body, 2 had the tail equal to the head and body, and in 16 it 

 was shorter. In 39 males from the same locality 1 had a tail larger, 

 1 had a tail of the same length as, and 37 had a tail shorter than the 

 head and body. 



The legs are not especially stout. There are four intercostal 

 spaces between the appressed toes. 



The length of the head is four and a half to five and a half in the 

 length of head and body. The head width is five to six in the length 

 of head and body. 



I have seen no specimens of this form with the skin of the head 

 rugose. The fact that I have seen no specimens from the North 

 Carolina mountains may have some bearing on this point. 



The tubercle canthus oculi is uniformly present. The male man- 

 dible is evenly and fully provided with teeth, but the outline of the 

 jaw is strongly flexuous and serves as a very certain and easy means 

 of distinguishing the sexes when adult. 



The costal grooves are usually 14 in number. 



The color of this species had best be described from the standpoint 

 of development. The larval coloration is the key to that of the 



I These measurements apply to specimens from southeastern Pennsylvania, from which region over 250 

 specimens have been available. Tlie species averages smaller in the north and largest in North Carolina. 



