6a (5). Fore wing with membrane reticulate (= net-like); hind wing vestigial, with a forked apex; segments 1 and 2 of abdomen cylindrical, slender, forming a 2-segmented petiole (= narrow stem attaching abdomen to thorax) (Fig. A) (body length <1.5 mm); pronotum (= dorsal sclerite of prothorax) short, does not reach tegula (= small ....................................Chalcidoidea) (part...............................................................18

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6b. Fore wing membrane not reticulate; hind wing fully developed though often very narrow, but never with a forked apex; abdomen with at most 1st segment cylindrical and slender so that petiole, if present, has 1 segment.....................................................................................................7