1. Department of Entomology, Walter Reed Army Institute of Research, Washington, D.C. 20307
2. Division of Parasitology, Department of Microbiology, New York University Medical Center, New York, New York 10016
3. Malaria Section, Laboratory of Parasitic Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20205