1. USDA, ARS, PSI, Chemicals Affecting Insect Behavior Laboratory, Beltsville, Maryland 20705, Morgan State University, Department of Chemistry, Baltimore, Maryland 21251, V. N. Sukachev Institute of Forest, Siberian Branch, Russian Academy of Science, Department of Forest Zoology, 660036 Krasnoyarsk, Russia, USDA, APHIS, Otis Methods Development Center, Otis ANGB, Massachusetts 02542, and USDA, ARS, BA, Biometrical Consulting Service, Beltsville, Maryland 20705