1915.] 



natural sciences of philadelphia. 

 Cypress Bays. 



145 



A ncistrodon piscivorus, 

 Farancia ahacura, 

 Thamnophis s. sackeni, 



Thamnophis s. sackeni, 



A ncistrodon piscivorus, 

 Tropidonotus taxispilotus, 



Tropidonotus taxispilotus, 

 Tropidonotus fasciatus. 



Prairies. 



Tropidonotus fasciatus. 



"Water Courses. 



Elaphe obsoletus. 



Transition Zone Between Islands and Cypress Bays. 



Farancia ahacura, 

 Heterodon platyrhinus, 

 Crotalus adamanteus. 

 Coluber obsoletus, 



Diadophis punctatus. 

 Stover ia dekayi, 

 Haldea striatida. 



If these snakes be considered from the point of view of locomotion, 

 they fall into the same four groups which Loennberg (1895, pp. 

 336, 337) made, and the snakes are quite similarly, but not absolutely, 

 arranged as he found them : 



Swimming Forms. 



T. taxispilotus, 

 T. fasciatus, 

 T. s. sackeni. 



H. platyrhinus, 

 F. ahacura, 



T. s. ordinatus, 

 C. constrictor, 

 L. getulus, 

 L. d. coccineus, 

 S. miliarius, 

 C. adamanteus, 

 C. horridus, 



E. obsoletus, 

 E. guttatus, 

 O. cestivus, 

 10 



A. piscivorus, 

 F. ahacura. 



Burrowing Forms. 



L. d. coccineus, 

 L. getulus. 



Crawling Forms. 



E. obsoletus, 



D. punctatus, 



E. guttatus, 

 & dekayi, 



S. occipitomaculata, 

 H. striatula. 



Climbing Forms. 



C. constrictor, 

 L. d. coccineus. 



