1. Department of Entomology, Oregon State University, Corvallis, OR 97331-2907, USA
2. Department of Entomology, Oregon State University, Corvallis, OR 97331-2907, USA; Molecular Probes, Inc., 4849 Pitchford Ave., Eugene, 97402-9165.
3. Warsaw University, Department of Invertebrate Physiology, Zoological Institute, 93 Zwirki & Wigury St., Warsaw, Poland 02-089