Siphonaptera Collected During the 1 965 Street Expedition to Afghanistan'' INTRODUCTION Although the primary objective of the 1965 Street-Field Museum of Natural History Expedition to Afghanistan was to conduct a mammal survey of the country, a number of other collections of both flora and fauna were made. Notable among these were land snails, reptiles, amphibians, and ectoparasitic arthropods. A narrative and itinerary of the expedition, as well as discussions of the physiography, climate, phytogeography, and ecology of the areas visited appears in Hassinger (1968) and need not be repeated here. The expedition was in the field from July 11 to November 22, and 2,014 mammals were collected. Most of these were hosts to fleas, mites, ticks, and/or lice. Representatives of the species of fleas collected during the expe-dition have been retained in the collection of the author. The re-mainder, including types, have been deposited in the collections of Field Museum of Natural History. h ' Portions of this study were supported by grants from the United States Public Health Service, National Institutes of Health Grant Al 05512-01 TMP; research project N62558-5023, Office of Naval Research, U.S. Navy European Research Contracts Program, Brussels, Belgium, to the American University of Beirut, Beirut, Lebanon; and research project N00014-68-A-0101-0001, Office of Naval Research, Navy Department, Washington, D.C. 20360 to Iowa State University, Ames, Iowa, 50010. The opinions and assertions contained herein are the private ones of the author and are not be construed as official or as reflecting the views of the Department of the Navy or the naval service at large. * Journal Paper No. J-6860 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1715.