50a (49). Antennae inserted on head surface (face) between anterior eye margin, with <14 segments (Figs.A-B); 1st antennal segment shorter than next 2 segments combined; eyes smooth; last segment of maxillary palpus tapering; posterior coxae large, contiguous (Fig. B); fore wing thickened (= corneous), without venation (Figs. A-C); tarsi with 5 segments; size varies with host size; solitary ectophagous parasitoids on pupae within the puparium.............................................................................(Staphylinidae) - (Aleocharinae) - ......Aleochara spp.

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50b. Antennae not situated on head surface, but rather at front or side margin; otherwise not having previously described characteristics ........................................................................................................................................................[not parasitic on synanthropic Diptera]