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Abstract
Sixteen species from the following six orders of insects have been recorded as breeding on pteridophytes of the Lycopsida: Homoptera, Thysanoptera, Mecoptera, Diptera, Hymenoptera and Lepidoptera. All but one of these is from Selaginella, the exception being a pyralid moth from Lycopodium in Hawaii. Three new species are described from Selaginella eurynota in Costa Rica: Aleurotulus pteridophytae Martin sp. nov. (Homoptera, Aleyrodidae), Encarsia sueloderi Polaszek sp. nov. (Hymenoptera, Chalcidoidea), a parasitoid which was reared from the whitefly, and Echinothrips selaginellae Mound sp. nov. (Thysanoptera, Thripidae).
