1. Department of Fish, Wildlife, and Conservation Ecology New Mexico State University P. O. Box 30003, MSC 4901 Las Cruces 88003 NM USA
2. Department of Biology Furman University 3300 Poinsett Highway Greenville 29613 SC USA
3. U.S. Geological Survey, New Mexico Cooperative Fish and Wildlife Research Unit New Mexico State University P. O. Box 30003, MSC 4901 Las Cruces 88003 NM USA