1. Department of Environmental Conservation, University of Massachusetts, Amherst, Massachusetts 01003, USA; E-mail: (R. G. V. D.)
2. USDA ARS, Beneficial Insects Introduction Research Unit, Newark, Delaware 19713, USA; E-mail: (J. D.)
3. 2400 West Campus Drive, University of Alaska, Anchorage, Alaska 99508, USA; E-mail: (J. O.)