1. Department of Veterinary Biosciences, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 South Lincoln Avenue, Urbana, Illinois 61802, USA
2. Current Address: A and E Animal Hospital, 3003 East Windsor Road, Urbana, Illinois 61820, USA
3. Veterinary Teaching Hospital and Clinics, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana 70803, USA
4. Illinois Natural History Survey, Center for Biodiversity, 607 East Peabody Drive, Champaign, Illinois 61820, USA