1. U.S. Geological Survey, Fort Collins Science Center, Department of Biology, Albuquerque, NM 87131.
2. U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Ave., Bldg. C, Fort Collins, CO 80526.
3. U.S. Fish and Wildlife Service, Kofa National Wildlife Refuge, 9300 E. 28th St., Yuma, AZ 85364.