3. Color above brownish 4. 

 Color above bluish or black 5. 



4. With faint stripes 



Storerm Little Brown Snakes 

 Color almost plain — three common genera 

 Carphophis Worm Snakes 

 Haldea Ground Snakes 

 Tanulla Black-headed Snakes 



5. With red side bars 



Faranaa Horn Snake 

 Not so 



Coluber (part) Whip Snakes and Racers 



6. With narrow cross rings around the body or with a band or ring around 



the neck 7. 



Back striped, spotted, mottled, blotched or barred 11. 



7. With a light ring around the neck — two common genera 



Diadoph\s Ring-necked Snakes 

 Tanulla Black'headed Snakes 

 With rings around the body 8. 



8. With red, black and yellow rings completely encircling the body, with 



the yellow adjacent to the red 

 Micrurus Coral Snakes 

 Color not so 9. 



9. With rattles on the tail 



Crotalus Banded Rattlesnakes 

 No rattles on the tail 10. 



10. Scales smooth 



Lampropeltis (part) King Snakes 

 Scales keeled 



J^atrix (part) Water Snakes 



11. Back and sides striped 12. 

 Back spotted, mottled, blotched or barred 13. 



12. With three light stripes lengthwise along the back and sides — two com' 



mon genera 



Trop}doclonion Striped Swamp Snake 

 Thamnophis Garter Snakes 

 Less definitely striped — some of the species of the following genera 

 ?{atnx Water Snakes 

 Elaphe Chicken Snakes 

 Coluber Whip Snakes and Racers 

 Storeria Brown Snakes 



1 3. With rattles on the end of the tail 



Sistrurus Pigmy Rattlesnakes 

 Crotalus Larger Rattlesnakes 

 No rattles 14. 



14. With a pit between the eye and the nostril; pupil of eye vertical 



Ag\istrodon Moccasin 

 No pit between the eye and the nostril; pupil of eye round 15. 



421 



