A total of 130 species of thrips occurring in Africa, Europe, and the Mediterranean region were intercepted by U.S. agricultural quarantine officers from shipments of cut flowers and other plants at various ports-of-entry in the United States from 1983 to 1999. This is Part 4 of a guide to the identification of thrips coming into this country from these regions: it uses keys, line drawings, and scanning electron micrographs to identify 51 species in 36 miscellaneous thripid genera not covered in Parts 2 and 3. Of the 321 records identifiable to species, 70% of the interceptions were attributed to ten species: Odontothrips karnyi Priesner clearly was most commonly intercepted, with substantially smaller percentages attributed to Limothrips cerealium (Haliday), Anaphothrips obscurus (Müller), Neohydatothrips samayunkur (Kudo), Limothrips denticornis (Haliday), Synaptothrips distinctus (Bagnall), Tenothrips discolor (Karny), Ceratothripoides brunneus Bagnall, Ceratothrips ericae (Haliday), and Mycterothrips latus (Bagnall). Descriptions of these ten species are provided.