1. (JMB) Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, USA (e-mail: )
2. (DHJ, WH) Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA (e-mails: , whallwac@sas.upenn.edu)
3. (NVG) Department of Biophysics, or Department of Biochemistry, or Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390-9050, USA (e-mail: )