These small hymenopterans belong to a group with a very large number of species. Their larvae live as parasites in other insect species. The female inserts an egg into the victim with the help of her ovipositor, and in some cases this organ can also be used as a defensive weapon. The small dark parasitic forms which are common in houses (see p. 150) will normally not sting humans. There are, however, species which can give a mild, but irritating, sting.
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