406 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



Three costal interspaces between appressed toes of adult. Tail 

 keeled above. A distinct color pattern, BeUy uniform, pale. Trans- 

 formed specimens: Total length 30-135 mm.; head and body 17-64 mm. 



Description. — The vomerines form two short slightly arched series 

 which approximate each other in the median line. The parasphe- 

 noids are usually confluent anteriorly. They are long narrow series 

 and are well separated from each other save in front. Their distance 

 from the vomerines is about equal to the length of one of the vomerine 

 series. The shape of the tail is about as in fusca. The relative 

 length is greater. It is not as flattened as in quadramaculata. 



The legs are stout. In young specimens the appressed toes are 

 separated by two costal interspaces, in adults by three. 



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

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

 and body. 



This is the second largest form in the genus with medium head and 

 body, long tail, and medium legs. 



The skin of the head is often rugose as in quadramaculata. The 

 costal grooves are 13 or 14 in number. There is always a tubercle 

 in the anterior angle of the eye. 



The color of this form is much like that oi fusca, but shows certain 

 differences. The light dorsal spots are smaller and more hea\dly out- 

 lined with dark. They do not break up until the animal is practi- 

 cally mature; whereas in fusca it is seldom, even in the smallest trans- 

 formed specimens, that they have not coalesced into a light dorsal 

 band. When these spots do coalesce in monticola portions of the 

 dark outhne are left as conspicuous dark spots on the generally pale 

 dorsal band. The ventral coloration is practically uniform and lacks 

 all trace of the motthng so conspicuous in fusca. The sides are not 

 mottled as in fusca, but the dark lateral band merges gradually into 

 pale ventral surface. In the young the belly is white. A uniform 

 pigmentation gradually encroaches on the belly from the sides in- 

 ward and from behind forward, so that the last unpigmented part 

 of the ventral surface is between the fore legs. Eventually the whole 

 belly is uniformly and lightly pigmented. In a few specimens this 

 pigmentation is fairly dark, never, however, becoming as dark as in 

 quadramaculata. In comparing monticola with the latter, it should 

 be remarked that monticola usually retains traces of the dorsal pat- 

 tern and never has the hght lateral band so characteristic of young 

 and medium quadramaculata. 



The only sexual difference discernible is the very slightly more 

 flexuous outline of the male jaw. The testes are unpigmented as in 

 quadramaculat a . 



Hahits. — This species resembles fusca very closely in its habitat 

 relations. It is not nearly so aquatic as quadramaculata, and is 

 tound only in small streams. The rocky edges of the mountain 



