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Body usually 1.5 mm or less in length. |
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Head with H-like pattern of mark (transverse membranous suture or trabecula or carina below anterior ocellus and also along inner eye margins, rarely with additional sutures behind ocelli. |
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Antennal torulus usually only about its own diameter from eye, conspicuously closer to eye than to other torulus. |
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Scutellum normally divided transversely into an anterior and posterior part. |
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Fore wing with venation greatly reduced.
Hind wing stalked or petiolate, the membrane of the disc usually originating apically from the stalk or rarely with stalk only. |
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Tarsi 4-segmented (or) |
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Tarsi 5-segmented. |
