105a (103b). Anal cell open or closed near wing margin; antennal style short, never longer than

3rd antennal segment; body usually hairy, stocky and somewhat humpbacked; brown or

grayish flies (Figs.A-C) (parasitize a variety of immature arthropods; most common

in southwestern United States).............................................….................….......(Diptera) Bombyliidae

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A B C

105b. Anal cell short and closed far from wing margin; anal vein does not reach wing margin;

antennal style (= bristle) usually longer than 3rd antennal segment; body usually bare,

slender and black (Fig.A) (predators of small arthropods).......…….....................(Diptera) Empididae

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A