In the laboratory in Florida, 4 synthetic pyrethroids, fenvalerate [cyano(3-phenoxyphenyl)methyl 4-chloro- alpha -(1-methylethyl) benzeneacetate], permethrin, NRDC-149 [cyano(3-phenoxyphenyl) methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate] and buthrenin [of unstated composition], as well as the carbamate methomyl, were evaluated at 2 application rates as deposits on filter paper for their contact toxicity to adults of 5 species of economic parasites, Diglyphus intermedius (Gir.), Opius bruneipes Gah., Apanteles sp., Litomastix truncatella (Dalm.) (Copidosoma truncatellum) and Telenomus remus Nixon. Methomyl was highly toxic to all species at the maximum rate tested, and at least 1 of the synthetic pyrethroids caused significantly less mortality to each species. Fenvalerate was generally the least toxic to the parasites and is therefore the most promising compound for use in a pest management programme for the control of Keiferia lycopersicella (Wlsm.) and Liriomyza sativae Blanch. on tomato. none