NORTH AMERICAN BATRAOHIA AND REPTILIA. 
11 
19. A. jeffersonianum , subsp. platineum , Cope. Widtli of 
head five and five-tenths to six times in length to groin; tooth 
series slightly convex; lead-colored above; paler below, with or 
without indistinct whitish blotches. Ohio; Southwest Illinois. 
B. Palatine series of teeth not extending laterally behind 
inner nares; plicae of tongue radiating from a median longi- 
tudinal furrow; no distinct parotoid mass; four phalanges in 
fourth toe; no can thus rostralis; species small; costal grooves 14. 
20. A. cingulatum , Cope. 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 nares; color black; beneath thickly speckled with 
gray; a vertical gray line between each pair of costal folds, which 
either meet the opposite one on the median line, or bifurcate 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 Alleglianies. 
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 premaxillary bones, with fontanelle. 
x. Digits 4: A Ilemidactylium. 
y. Digits 4-5 Plethodon. 
h. One premaxillary, without fontanelle. Digits 4-5. 
Stereochilus. 
B. Tongue free all around, attached only by the central 
pedicel; parietals well ossified; digits free. 
a. One premaxillary, with fontanelle. 
. x. Digits 4 7 4 Manoulus. 
y. Digits 4-5 Spelerpes. 
h. Two premaxillaries, with fontanelle. Digits 4-5. 
Gyrinophilus. 
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