104a (103a). Fourth vein (M-1) ends beyond apex of wing (Figs.A-C) (larvae & adults are

predators of other arthropods) .........................................…..........................(Diptera) Therevidae

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A B C

104b. Fourth vein (M-1) ends before apex of wing (Fig.A) (both adults & larvae are

predatorsof other arthropods; rare in arid regions of western North America) ...................

............................................................................................…......................…..........(Diptera) Apioceridae

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A