1. Oklahoma Department of Wildlife Conservation, 1801 N. Lincoln Blvd., Oklahoma City, Oklahoma 73512, U.S.A
2. Oklahoma Biological Survey, 111 E. Chesapeake St., The University of Oklahoma, Norman, Oklahoma 73069, U.S.A
3. Department of Biology, University of Texas Rio Grande Valley, 1201 W. University Dr., Edinburg, Texas 78542, U.S.A