NORTJJ AMKRICAN IJATRACHIA A^•I) KKI'TILIA. 35 



11. Genus Diadophis, B and G. 



Nasals two ; loral present ; postorbitals two ; anteorbitals 

 two, rarely equal in size; dorsal scales smooth, anal divided; eye 

 large ; Lead depressed ; unicolor, with generally a light ring on 

 the occipital region. 



A. Dorsal rows 15. 



"■29. D. punctatus^ subsp. jpunctatus^ (Linn.) Cope. Ring- 

 necked Snake. Eye over fourth and fifth upper labials ; body 

 above bluisli-black; beneath yellowish-orange, with a series of 

 sub-triangular spots along sides of scutellaj, and sometimes a 

 similar medial series; tail beneath unicolor; eight upper labials 

 and chin yellowish ; a yellowish-white occipital ring, about two 

 scales wide; G. 140-160. United States and Canada, east of 

 the plains, and Texas. 



30. D. punctatus^ subsp. amahilis, (B. and G.) Cope. 

 Eye over third and fourth upper labials; above blackish-brown; 

 beneath yellowish-white, with crowded small black spots from 

 head to end of tail; the seven upper labials and chin blackish- 

 brown; occipital ring narrow; scales on sides considerably 

 larger than those on back; G. 180-185. Western United 

 States, east to Ohio. 



JJ. Dorsal rows 17. 



31. J), arn^i, ILenu. Color above uniform leaden-black; be- 

 neath yellow, spotted thickly and irregularly with black; the 

 spots on under part of neck smaller; occipital ring light yellow, 

 narrow, one and two half scales wide. Illinois and Kansas. 



12. Genus Dbomicus, Bibron. 

 Posterior maxillary tooth largest, not grooved, separated by 

 an interspace from the rest; nasals two; loral rarely wanting; 

 postorbitals two; dorsal scales rather short, rarely slightly cari- 

 nate; generally in 17 or 19, exceptionally in 15 or 23 rows; 

 anal divided ; eye moderate. 



32. D. Jfavilatus, Cope. Nostril in the prenasal; color 

 above golden brown; the two lower rows of scales gold-edged; 

 color of back commencing on the third row of scales ; vertebral 

 row sometimes darker tipped; below whitish; dorsal rows 17; 

 G. 126. Coast of North Carolina. 



13. Genus CrcLorHis, Glinther. 

 Teeth equal, smooth; snout protruding; loral one, occasion- 

 ally wanting; postorbitals two; dorsal scales smooth or carinate; 

 anal divided; eye large. 



