Crayfish Predation by Water Snakes 
99 
Mushinsky, H. R., and J. J. Hebrard. 1977. Food partitioning by five 
species of water snakes in Louisiana. Herpetologica 33:162-166. 
Mushinsky, H. R., and K. H. Lotz. 1980. Chemoreceptive responses of 
two sympatric water snakes to extracts of commonly ingested prey 
species: Ontogenetic and ecological considerations. Journal of Chemi- 
cal Ecology 6:523-535. 
Neill, W. T. 1951. Notes on the role of crawfishes in the ecology of 
reptiles, amphibians and fishes. Ecology 32:764-766. 
Neill, W. T., and E. R. Allen. 1956. Secondarily ingested food items in 
snakes. Herpetologica 12:172-174. 
Penn, G. H. 1950. Utilization of crawfishes by cold-blooded vertebrates 
in the eastern United States. American Midland Naturalist 44:643- 
658. 
Sisk, M. E., and C. J. McCoy. 1964. Stomach contents of Natrix r. 
rhombifera (Reptilia: Serpentes) from an Oklahoma lake. Proceedings 
of the Oklahoma Academy of Science 44:68-71. 
Zelnick, G. E. 1966. Midsummer feeding habits of the midland water 
snake. The Southwestern Naturalist 11:311-312. 
Accepted 18 March 1993 
