1. U.S. Geological Survey, Patuxent Wildlife Research Center, National Museum of Natural History, MRC-111, P.O. Box 37012, Washington, D.C. 20013-7012, USA
2. Museum of Vertebrate Zoology, 3101 Valley Life Sciences Building, University of California, Berkeley, California 94720-3160, USA
3. RR2, Box 52R, Bishop, California 93514, USA
4. Florida Museum of Natural History, P.O. Box 117800, University of Florida, Gainesville, Florida 32611, USA
5. Michigan State University Museum and Department of Zoology, West Circle Drive, East Lansing, Michigan 48824-1045, USA
6. Museum of Natural Science, Louisiana State University, Foster Hall 119, Baton Rouge, Louisiana 70803, USA
7. Department of Zoology, Ramsay Wright Zoological Labs, University of Toronto, Toronto, Ontario, M5S 3G5, Canada
8. Environmental and Conservation Programs, Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, Illinois 60605-2496, USA