15. Rostral plate turned up and keeled above 

 Heterodon Hog'nosed Snakes 

 Not so — some of the species of the following genera 

 Lampropeltis King Snakes 

 l^latrix Water Snakes 

 Elaphe Chicken Snakes 

 Coluber Whip Snakes and Racers 

 Pituophis Bull Snakes 

 Thamnophis Garter Snakes 



GENERAL REFERENCES 



Blanchard, F. N. 1921. A Revision of the King Snakes. Bull. U. S. Nat. 



Museum 114. Washington. 

 Blanchard, F. N. 1924. A Key to the Snakes of the United States, Canada 



and Lower California. Papers Mich. Acad. Sci. Arts and Letters, Vol. 



4 . Part 2. Ann Arbor. (Reprinted in 1939.) 

 Brown A. E. 1901. A Review of the Genera and Species of American 



Snakes, North of Mexico. Proc. Acad. Nat. Sci. Phila., Vol. 53. 

 Clay, W. M. 1938. A Synopsis of the North American Water Snakes of 



the Genus Natrix. Copeia, 1938, No. 4. Ann Arbor, Mich. 

 Conant, R. and Bridges, W. 1939. What Snake is That? D. Appleton- 



Century Co. New York. 

 Cope, E. D. 1900. The Crocodilians, Lizards and Snakes of North America. 



From the Report of the U. S. Nat. Museum for 1898. 

 Ditmars, R. L. 1936. The Reptiles of North America. Douhleday, Doran ^ 



Co. New York. 

 Gloyd, H. K. 1940. The Rattlesnakes, Genera Sistrurus and Crotalus. 



Special Pub. No. 4. The Chicago Academy of Sciences. Chicago. 

 Klauber, L. M. 1936. A Key to the Rattlesnakes with Summary of Charac' 



teristics. Trans. San Diego Soc. Nat. Hist., Vol. 8. 

 Klauber, L. M. 1948. Some Misapplications of the Linnaean Names Applied 



to American Snakes. Copeia, 1948, No. 1. Pg. 1-14. 

 Ortenburger, A. L 1928. The Whips Snakes and Racers. Univ. of Mich. 



Studies. Memoirs of the Univ. of Mich. Museums, Vol. L Ann Arbor. 

 Pope, C. H. 1937. Snakes Alive and How They Live. Viking Press, New 



York. 

 Ruthven, A. G. 1908. Variations and Genetic Relationships of the Garter 



Snakes. Bull. U. S. Nat. Museum 61. Washington. 

 Schmidt, K. P. and Davis, D. D. 1941. Field Book of Snakes. G. P. Put- 

 nam's Sons. New York. 

 Stejneger, L. and Barbour, T. 1943. A Check List of North American Am' 



phibians and Reptiles. Fifth edition. Harvard University Press, Cam- 



bridge. 

 Van Denburgh, J. 1912. The Reptiles of Western North America. Cal. 



Acad, of Science. Occ. Papers 10. San Francisco. 



Klauber (1948) has determined the names of five of our common snakes 

 as follows: Thamnophis ordinatus for T. sirtahs, Thamnophis sirtahs for T. 

 sauritus, Ag\istrodon contortrix for A. mo\eson, Heterodon platyrhinos for H. 

 contortrix, and Lampropeltis doliata for L. triangulum. The names used as 

 first choice in the snake key are those given in the fifth edition of Stejneger and 

 Barbour's Check List. 



422 



