NORTH AMERICAN BATRACHIA AND REPTILIA. 
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20. Genus Tropidoclonium, Cope. 
Nasal one; grooved below nostril; ioral present; anteorbital 
one; postorbitals two; dorsal scales carinate; anal divided. 
62. T. kirtlandi , (Kenn.) Cope. Kirtland’s Snake. Body 
stout; bead small, continuous with neck; tail short and small; 
ground color light reddish-brown, with four dorsal series of 
circular black spots, the two central series smallest; beneath 
uniform reddish, with a row of small black spots on each side; 
dorsal rows 19; G. 130-140. Illinois to Ohio. 
21. Genus Tropidonotus, Kuhl. 
Nasals two; loral present; anteorbitals one or two; postor- 
bitals two or three; all dorsal scales carinate, except occasionally 
one or two outer rows; anal divided. 
A. Five or more longitudinal bands on a light ground. 
63. T. grahami , B and G. Anteorbitals two; postorbitals 
three, lower very small; a light brown dorsal band, on each side 
of which is a narrow black band, three scales below is a second 
black line, and between the abdomen and sides a third; above 
the second line the scales are brown, below it straw color; 
beneath yellowish, with a blackish band under tail; dorsal rows 
20, all carinate; G. 160-165. Mississippi Valley to Wisconsin; 
Michigan. 
64. T. leberis, Linn. Anteorbitals two, upper larger; post 
two, upper smaller; color above chestnut or chocolate-brown; a 
black band on median row of scales, another on the fifth, and a 
broader yellow band on the first and second; beneath yellowish, 
with two brown bands; dorsal rows 19, all carinated. Austrori- 
parian and Eastern regions. 
65. T. rigidus , Say. Anteorbitals two, upper larger; post 
two, nearly equal in size; color above greenish-brown, with a 
deeper brown spot at base of each scale on the flanks; two brown 
bands on back; beneath dull yellowish, with two series of brown 
blotches; dorsal rows 19, two outer obsoletely or not at all cari- 
nated. Pennsylvania to Georgia, east of the Alleghanies. 
B. Unicolor or transversely barred or blotched. 
x. No suborbital plates. 
Dorsal rows 19, all carinated. 
66. T. compsolcemus , Cope. 'Postorbitals three, lower very 
small; color above blackish-brown, with indistinct pale transverse 
bands, two or three scales apart; beneath a stone-brown, generally 
