100 PROCEEDINGS OP THE ACADEMY OP 



Costal plicse 13 ; form stout, head large, wide ; lower jaw wider than upper ; 

 muzzle broadly truncate ; tail slender subcylindcic ; black, limbs, belly, and 

 spots of back, orange P. croceater. 



Costal pliese 10 — 11 ; form stout, head wide, maxillaries wider than mandi- 

 ble ; muzzle narrowly truncate ; tail slender, subcylindrical ; light brown 

 above ; limbs and below yellow P. oregonensis. 



Plkthodon EBYTHHONOT08 Green. 

 Var. a. cineretis, 

 Sal. c. (Sept. 1818) Green, J. A. N. S. i. 356. 

 P. c. (1838) Tsch., Class, der Bat. Baird, Journ. A. N. Sci. (2) 1 p. 



Var. /?. erythronotus. 

 Sal. e. (Sept. 1818) Green, J. A. N. S. i. 356. (1838) Holb. Herp. III. 13, 

 pi. 27. (1842) 2d ed. v. 43, pi. 11. (1840) Storer, Mass. Kept. 245. (1842) 

 Dekay, N. Y. Kept. 75, pi. 16, f. 38. 



Plethodon erythronotus Baird 1. c, Hallowell 1. c, 1858, 343. 



N.B. — Green quotes this species from Raf , whose description I cannot find. 



Var. y. dorsaUs, Baird, M. S. 

 3776. Louisville, Ky. ; Salem, Mass. 



Plkthodon intbrmbdius Baird. 



Proceedings Acad. Nat. Sci. Phila. 1857, 209. 

 Vancouver I. 



Plethodon glutinosub Green. 



Sal. g. (Sept. 1818) Green, J. A. N. S. i. 357. (1838) Hoi. Herp. 1st ed. ii, 

 129, pi. 30. (1842) 2d ed. v. 39, pi. 10 ? ? (1849) Storer, Mass. Kept. 259, 

 an. A. Jefifersoniana ? (1842) Dekay N. Y. Kept. 81, pi. 17, f. 42 (very 

 young). 



Sal. variolata, (Dec. 1818) Gilliams, J. A. N. S. i. 460, p. 18, f, 1. 



Sal. cylindracea, (Nov. 1825) Harl., J. A. N. S. v. 156. 



Triton porphyriticus, (1842) Dekay, N. Y. Kept. 83, pi. 16, f. 37. 



P. g. (1838) Tschudi, Class, der Bat. 



Whole eastern district R. nearctica. 



Plethodon oregonensis Girard. 



Heredia oregonensis Girard, Proc. Acad. Nat Sci. Phila. viii, 1856, 235. Gi- 

 rard, U. S. Expl. Ex. Herpet. 1858, 11. Hallowell, Pr. A. N. S. Phil, viii, 1856, 

 235. 



Plethodon ensatus Cope, Proc. Acad. Nat. Sci. Phil. 1867, 167, e Triton en- 

 satus Esch. = Ensatina eschsckoltzii Gray = Heredia oregonensis Girard fide 

 Mivart nee Eschscholtzii species 1 



Oregon, California. 

 Plethodon croceater Cope. 



Proceed. Ac. Nat. Sci. Phil. 1857, p. 210. 



Lower California. 



STEREOCHILUS Cope. 



Char. Tongue attached along the median line to the anterior margin. Pte- 

 rygoid teeth in two elongate patches. Toes 4 — 5. Premaxillary bones COU" 

 fluent, with a simple spine, without fontanelle. 



This genus is represented by but one species of the Eastern district of the 

 Nearctic region. It ia evidently of aquatic habits and is of larva-like propor- 

 tions and appearance, but has the cranium fully developed, and in some re- 

 spects more solidly than its allies. In the only skeleton I have examined, the 

 prefrontal is present on one side and wanting on the other. The premaxillary 

 bone is like that of Desmognathus, while the tongue is slightly freer than in 

 Plethodon. The species exhibits weak extremities. It is from S. E, Georgia, 

 and is quite rare. 



[May, 



