Plate 15. Fig. 1. Massasauga, Sisirunis calenaius calenaius. Near Holland, Lucas 

 County, April 20, 1930. Length about 30 inches. Phcto by R. Ccnant. Fig. 2. Timber 

 Rattlesnake, Croial ts horridus horridus (yellow phase). Shawnee Forest, Union Twp., 

 Scioto County, July 9, 1928. Length 40^4 inches. Photo by Edward S. Thomas. 

 Fig. 3. Timber Rattlesnake, Crotalus horridus horridus (dark phase). Paxt:n Twp., 

 Ross County, July 3, 1931. Length 47 inches. Photo by R. Conant. 



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