2a (1). Body with a constriction between the 1st and 2nd abdominal segments, giving the appearance of abdomen being narrowly joined to thorax (Figs. A-B) (may not be obvious in some species, but these have no enclosed cells in the fore wing); long-winged or short-winged, if long-winged then fore wing without an enclosed anal cell; hind wing usually has 2 or less closed basal cells; no rounded projections on metanotum; ovipositor not developed into a sting (Figs. A B).............. .............(APOCRITA--Parasitica).......3

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2b. Same as previous except that ovipositor not used for egg-laying but rather developed into a weapon for injecting venom and used for hunting, defense and aggression (sting); eggs discharged from apical gastral segments, at base of sting (Figs. A-C) .............................................................................................................................(APOCRITA--Aculeata)....[not parasitic on synanthropic Diptera]

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