272 AMPHIBIANS AND REPTILES. 



1898. Cope. E. D. The Crocodilians. Lizards and Snakes of North 

 America. Kept. U. S. Nat. Mus., 1898, pp. 153-1270. 



1907. Ditmars, R. The Reptile Book. New York. 



1908. Strecker, John K. Notes on the Breeding Habits of Phry- 

 nosma Cornutum and other Texas Lizards. Proc. Biol. Soc. 

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1908. Ruthven, Alexander G. Variations and Genetic Relation- 

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1909. Ruthven, Alexander G. Notes on Michigan Reptiles and 

 Amphibians. 11th Ann. Rept. Mich. Acad. Sci., pp. 116-117. 



1910. Ruthven, Alexander G. Notes on Michigan Reptiles and 

 Amphibians, II. 12th. Ann. Rept. Mich. Acad. Sci., p. 59. 



