1. University of Maryland, Department of Zoology, College Park, MD 20742, and Insect Chemical Ecology Laboratory, Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA), Beltsville, MD 20705.
2. Insect Biochemistry Section, Bioscience Research Laboratory, ARS, USDA, Fargo, ND 58101.
3. Insect Chemical Ecology Laboratory, ARS, USDA, Beltsville, MD 20705.