PROC. ENTOMOL. SOC. WASH. 106(2), 2004, pp. 438-452 COMMONLY INTERCEPTED THRIPS (THYSANOPTERA) FROM EUROPE, THE MEDITERRANEAN, AND AFRICA AT U.S. PORTS-OF-ENTRY. PART II. FRANKLINIELLA KARNY AND IRIDOTHRIPS PRIESNER (THRIPIDAE) David A. Nickle Systematic Entomology Laboratory, PSI, Agricultural Research Service, U.S. Depart-ment of Agriculture, Building 005, BARC-West, 10300 Baltimore Avenue, Beltsville, MD 20705-2350, U.S.A. (e-mail: [email protected]) Abstract. — A total of 130 species of thrips occurring in Africa, Europe, and the Med-iterranean region were intercepted by U. S. agricultural quarantine officers in shipments of plants and cut flowers at the various ports-of-entry in the United States from 1983 to 1999. Of these, four species of Frankliniella (F. occidentalis Pergande, F. intonsa Try-bom, F. schultzei (Trybom), and F. tenuicornis (Uzel) rank within the top ten most fre-quently encountered species over this time period. This paper is Part II of a guide to the identification of thrips coming into this country from those regions; it uses keys, line drawings, and scanning electron micrographs to identify the commonly intercepted species of the genera Frankliniella (with 9 species from that region) and Iridothrips (with 2 species) — both of which are characterized by the presence of ctenidia located anteriad of abdominal spiracle VIII. It is designed primarily to aid the identification capabilities of the U.S. Department of Agriculture, Animal and Plant Health Inspection Service (USDA, APHIS) identifiers at U.S. ports-of-entry, but those interested in thrips in general will also benefit from this information. Key Words: thrips, pests of flowers, Europe, Africa This paper is the second of a series in-tended to facilitate identification of thrips species commonly intercepted at U.S. ports on a wide range of agricultural commodi-ties from Africa, Europe, and the Mediter-ranean region. It lists the most commonly encountered species of Frankliniella Pries-ner, 1940 and Iridothrips Karny, 1910, and presents identification keys to the relevant species. Frankliniella and Iridothrips are characterized by having ctenidia anteriad of abdominal spiracle VIII. They are similar to Baliothrips Uzel, 1895, Isochaetothrips Moulton, 1928, Microcephalothrips Bag-nail, 1926, and Thrips Linnaeus, 1758. These genera differ by having ctenidia on abdominal tergite VIII located posteriad of abdominal spiracle VIII. Frankliniella is the second largest genus of thripiine Thysanoptera, with 151 New World and 7 Palearctic species (Nakahara 1997). They include major agricultural pests, and several species are vectors of var-ious tospoviruses (Wijkamp et al. 1995). Since most species feed on pollens, they are often intercepted at U.S. ports-of-entry in a wide variety of flowers. Although Irido-thrips was synonymized as an aberrant form of Frankliniella by Mound et al. (1976), it was reinstated as a valid genus by Chaisson (1986), with two species — /. iridis (Watson, 1924) and /. mariae Pelikan, 1961. Both of these species have simple sense cones on antennal segment III. This paper is based on the adult female.