Previous identifications in North America ofTrichomalus perfectus(Walker, 1835) andMesopolobus morys(Walker, 1848) (Chalcidoidea: Pteromalidae), the principal chalcid parasitoids of the cabbage seedpod weevil (Ceutorhynchus obstrictusMarsham, 1802) in Europe, are shown to be misidentifications ofTrichomalus lucidus(Walker, 1835) andMesopolobus(Xenocrepis)moryoidessp. nov., respectively.Necremnus duplicatusGahan, 1941 (Chalcidoidea: Eulophidae) is synonymized formally underNecremnus tidius(Walker, 1839)syn. nov., confirming a previous, tentative synonymy. Both sexes ofN. tidius,M. moryoides, andT. lucidusare illustrated and compared with those of similar species using macrophotography and scanning electron microphotography. Hypotheses are offered to explain why the principal chalcid parasitoids of the cabbage seedpod weevil differ between North America and Europe and how the three treated species came to be in North America.
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Gibson et al. (2005) studied this question.
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