1. Molecular Genetics Laboratory, National Zoological Park, 3001 Connecticut Avenue NW,Washington, DC 20008, USA
2. Department of Biology, Pennsylvania State University, University Park, PA 16802, USA
3. US Geological Survey, Department of Biology, University of California, Riverside, CA 92521, USA
4. College of Forest Resources, University ofWashington, Seattle,WA 98195, USA