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Rhopalosomatidae (suborder Apocrita, superfamily Pompiloidea) Family of Hymenoptera, which are sometimes referred to the Scolioidea, but whose inclusion in the Pompiloidea is based on the possession and development of a preening calcar and strigil on the hind leg. Adults are slender and brownish, 6–25 mm long, and have long antennae each segment of which has two apical spines. The larvae are parasitic on the abdomens of small crickets (Gryllidae).

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