1. Departments of Entomology and Forestry, 243 Natural Sciences Building, Michigan State University, East Lansing, MI 48824-1115, USA.
2. Department of Entomology, 1980 Folwell Avenue, 219 Hodson Hall, University of Minnesota, St. Paul, MN 55108, USA.
3. Department of Entomology, 6126 Comstock Hall, Cornell University, Ithaca, NY 14853-2601, USA.
4. Department of Geography, 116 Geography Building, Michigan State University, East Lansing, MI 48824-1117, USA.