18a (6, 7, 13, 14). Hind femora greatly enlarged, ventrally toothed (either a few large or many small teeth) (Fig. A); prepectus reduced or fused, not triangular (Fig. B); if visible then not triangle-shaped; frons projected into 2 "horns" (around antennae) when viewed dorsally (often adhering soil particles as structure used for digging) (Figs. C-D); solitary parasitoids attacking mature host larvae or young pupae; general appearance (Fig. E)..................................................................................................................(Chalcidoidea) - Chalcididae (Dirhininae).............40

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18b. Hind femora not enlarged; ventral teeth if present, 2 or less or ventral edge serrated; prepectus in the form of a triangular plate (Fig. A); frons not projected into 2 "horns." ..................................................................................................................................................................19

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