1. Colorado Cooperative Fish and Wildlife Research Unit; Colorado State University; 201 Wagar Building Fort Collins CO 80523-1484 USA
2. I. C. T. Nisbet & Company; 150 Alder Lane North Falmouth MA 02556 USA
3. Massachusetts Division of Fisheries and Wildlife; 100 Hartwell St. West Boylston MA 01583 USA
4. Department of Biology; University of Massachusetts; Harbor Campus Boston MA 02125 USA