MARK E. RITKE,1 3 JEFFREY G. BABB,1 AND MARY K. RITKE,2 'Meeman Biological Field Station and Department of Biology, Memphis State University, Memphis, Tennessee 38152, USA, and 2Department of Pharmacology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA. 3Present Address: Section of Amphibians and Reptiles, Carnegie Museum of Natural History, 4400 Forbes Ave., Pittsburgh, Pennsylvania 15213, USA.
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