NORTH AMERICAN BATRACHIA AND REl'TILIA. 41 



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; head 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; Ioral 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 Yalley 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 hfth, and a 

 broader yellow band on the first and second; beneath yellowish, 

 with two brown bands; dorsal rows 19, all carinated. Austrori- 

 j^arian and Eastern regions. 



65. T. rigidus^ Say. Anteorbitals two, up]ier larger; post 

 two, nearly equal in size; color above greenish-brown, with a 

 deeper brown spot at base of each scale on the fianks; 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. 



(^Q. T. compsokemus^ 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 



