NORTH AMERICAN BATRACIIIA AND REI'TIIJA. 11 



19. A. jefersonianum,^ subsp. platineum, Cope. Width of 

 head five and live-tenths to six times in length to groin; tooth 

 series shghtly convex; lead-colored above; i)aler below, with or 

 without indistinct whitish blotches. Ohio; Soutlaoest lUinois. 



B. Palatine series of teeth not extending laterally behind 

 inner nares; plica? of tongue radiating from a median longi- 

 tudinal furrow; no distinct parotoid mass; four phalanges in 

 fourth toe; no canthus rostralis; species small; costal grooves 14. 



20. A. Gingulatum., Co])e. Mandible shorter than muzzle; 

 head elongate; width between eyes behind equal to distance from 

 same to nares; width of head six and a half times in distance to 

 groin; a strongly marked dorsal groove; palatine teeth entirely 

 between inner naves; color black; beneath thickly si)eckled with 

 gray; a vertical gray line between each pair of costal folds, which 

 either meet the opposite one on the median line, or bifurcat<e to 

 meet a similar bifurcation on the back; the annuli thus formed 

 extend from head to end of tail; L. three and one-half inches. 

 South Carolina. 



21. A. microstomum^ Cope. Mandible longer than muzzle; 

 head short; width between eyes behind equal to distance from 

 same to end of muzzle; body stouter than preceding; width of 

 head six and a half to seven times in distance to groin; dorsal 

 groove slight; color brownish black, paler beneath; usually with 

 thickly and irregularly sprinkled spots or patches of plumbeous 

 on sides, and less numerous spots above and below; L. four inches. 

 Eastern region, west of Alleghanies. 



Family PLETHODONTID^E. 

 Synopsis of Genera. 



A. Tongue attached from the central or posterior pedicel to 

 anterior margin in a narrower or wider band; maxillary normal, 

 with small teeth; parietals fully ossified. 



a. Two prem axillary bones, with fontanelle. 



X. Digits 4-4 Hemidactylium. 



y. Digits 4-5 Plethodon. 



b. One premaxillary, without fontanelle. Digits 4-5. 



Stereochilus. 



B. Tongue free all around, attached only by the central 

 pedicel; parietals well ossilied; digits free. 



a. One premaxillary, with fontanelle. 



X. Digits 4-4 Manoulus. 



y. Digits 4-5 Spelerjpes, 



h. Two premaxillaries, with fontanelle. Digits 4-5. 



Gyrinophilus. 



