66 HERPETOLOGY OF MICHIGAN. 



23. Whittiker, C. C. Variation in the Bine Racer. 7tli Ann. 

 Kept, Mich. Acad. Sci., 1905, pp. 100-102. A brief acconnt of the 

 natnral history and a discussion of the variation in scutellation 

 and proportionate size of extremities observed in 58 specimens of 

 Bascanion constrictor from Eaton County. 



24. Gibbs, Morris. Bibliography for the Amphibia, and Reptilia 

 of Michigan. 7th Ann. Kept. Mich. Acad. Sci., 1905, p. 111. A list 

 of the papers ''which directly refer to Michigan herpetology so far 

 as known to the 'writer." 



25. Ruthven, Alexander G. The Co'ld-Blooded Vertebrates of 

 the Porcupine Mountains and Isle Royale, Michigan. Rept. Geol. 

 Survey Mich, for 1905 (1906), pp. 107-112. Lists the species (5 

 snakes and 1 turtle) known to occur in the northern peninsula of 

 Michigan with notes on the habits and habitats. The list is based 

 principally on specimens secured by the expeditions of the Uni- 

 versity of Michigan Museum and upon the field notes of the writer. 



26. Hankinson, T. L. A Biological Survey of Walnut Lake, 

 Michigan. Rept. Mich. Geol. Surv., 1907 (1908), pp. 153-288. Con- 

 tains a list of eight species of reptiles from the vicinity of Walnut 

 Lake, Oakland Countv. 



27. Ruthven, Alexander G. The Cold-Blooded Vertebrates of 

 Isle Royale. Rept. Geol. Surv. Mich, for 1908 (1909), pp. 329-333. 

 A summary of the herpetology of Isle Royale based principally upon 

 the data secured by the University of Michigan Museum expeditions. 



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

 ships of the Garter-Snakes. Bull. U. S. Nat. Mus., 61, 1908. Con- 

 tains Michigan records of Thamnophis Jnitleri, T. sirtalis, and 

 T. sauritus and notes on the habits of these species. 



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

 Amphibians. 11th Ann. Rept. Mich. Acad. Sci., 1909, pp. 116-117. 

 The ^Titer shows that the Michigan specimens of wood-frog are 

 referable to the species cantahrigensls, extends the northward 

 range of Thamnophis 'butler i to Huron County, summarizes the dis- 

 tribution of Heterodon platyrhinns and Elaphe vnlpiniis in the 

 state, giving new records, and shows that Porcupine Mountain speci- 

 mens of Chrysemys are C. hellii. 



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

 Amphibians, II. 12th Ann. Rept. Mich. Acad. Sci., 1910, p. 59. 

 Records Rana septentrioiialis , Elaphe rulpimis and Chrysemys 

 hellii from Dickinson County. 



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

 Amphibians, III. 13th Ann. Rept. Mich. Acad, of Sci., 1911, pp. 

 114-115. Contains a summary of the distribution of Diadophis 



