1. Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
2. Department of Plant and Soil Sciences, University of Massachusetts, Amherst, MA 01003, USA
3. Department of Biology, Amherst College, Amherst, MA 01002, USA
4. Zoological Museum, Vertebrate Department, Universitetsparken 15 DK-2100 Copenhagen, Denmark
5. Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA