402 PROCEEDINGS OF THE ACADEMY OF [1895. 



48. Plethodon aeneus Cope. Web-footed Salamander. 



This species was found associating with glutinosus on the Cum- 

 berland table land near Chattanooga, which is in the type region. 

 The specimens were taken under the bark of rotten tree stumps 

 about three feet from the ground. Prof. Cope states "the terminal 

 phalanges are truncate and slightly expanded at the tips, as in the 

 P. glutinosus" In my specimens this truncation and expansion is 

 greatly exaggerated, especially on the hind feet, the tips of the toes 

 being nearly twice the diameter of the phalanges ; the latter are dis- 

 tinctly webbed and the soles and palms wider than long. The inner 

 toes of both hind and fore feet do not stand out from the plantar 

 circumference save as a right-angled border, being practically non- 

 functional as compared with the same members in glutinosus. In 

 other characters, including measurements, my adult specimen is a 

 duplicate of the type. The young individual is twenty-five milli- 

 meters long, but in all respects, except size, corresponds to the adult. 



Specimens: Sawyer's Springs, 1 ad., 1 juv. 



49. Plethodon erythronotus (Green). Red-backed Salamander. 



So far as I can identify the specimens on hand, this species is found 

 in both middle and west Tennessee. The series appears to confirm 

 the belief, based on collections from Pennsylvania, that the form 

 einereus is not a geographic but an individual variation which may 

 often be found in direct association with erythronotus in a single 

 colony. Erythronotus, on account of its precedence over einereus in 

 Dr. Green's original descriptions, should stand for the species, eine- 

 reus becoming a synonym. 



Specimens: Bellevue, 1 juv.; Roan Mountain (3,000 to 5,000 

 feet), 14 ad. and juv. 



Family AMBLYSTOMIDjE. 



Genus AMBLYSTOMA Tschudi. 



50. Amblystoma jeffersonianum (Green). Plumbeous Salamander. 



These sluggish salamanders are very numerous under logs below 

 the fir belt on Roan Mountain and a few even wander to a greater 

 elevation. They seem to replace P. glutinosus in this locality. The 

 series is very constant in coloration, bluish black above, dusky below, 

 with a brownish yellow chin and throat. There is no spotting, but 

 a close examination shows a light blue pitting along the sides and 

 tail and over the chest and abdomen. 



