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Small flies 1.5-5.0 mm long, rarely larger, with reduced bristling. Ocellar triangle characteristically well-developed. Propleuron anteriorly with sharp carina. Wing venation reduced; C with only subcostal break; A1+CuA2 and cell cup absent; CuA1 commonly with a distinct flexure opposite or before midlength of cell bm+cm. (Sabrosky 1987)