Scellus
Introduction '''''Scellus''''' is a genus of flies in the family Dolichopodidae. It is distributed in the Palearctic and Nearctic.Males of the genus have a pair of flag-like appendages, known as "''signa''" (singular "''signum''"), that emanate laterally from between the 4th and 5th abdominal segments. These appendages are connected together by a band under the sternites, forming a U-shaped structure called the "''cingulum''". It has been suggested by researchers that these appendages are used for visual signalling or pheromone dispersal during courtship. The genus ''Hydatostega'' also has a cingulum, but much reduced, suggesting that ''Scellus'' and ''Hydatostega'' are closely related.
Species *''Scellus abditus'' Hurley, 1995*''Scellus alactaga'' Stackelberg, 1951*''Scellus amplus'' Curran, 1923*''Scellus asaroticus'' Hurley, 1995*''Scellus avidus'' Loew, 1864*''Scellus bianchii'' Stackelberg, 1951*''Scellus coloradensis'' Harmston & James in Harmston & Knowlton, 1942*''Scellus crinipes'' Van Duzee, 1925*''Scellus dolichocerus'' Gerstaecker, 1864*''Scellus dyscritus'' Hurley, 1995*''Scellus exustus'' (Walker, 1852)*''Scellus filifer'' Loew, 1864*''Scellus gallicanus'' Becker, 1909*''Scellus grichanovi'' Naglis, 2012*''Scellus hissaricus'' Stackelberg, 1951*''Scellus knowltoni'' Harmston, 1939*''Scellus monstrosus'' Osten Sacken, 1877*''Scellus notatus'' (Fabricius, 1781)*''Scellus obuchovae'' (Stackelberg, 1951)*''Scellus paramonovi'' Stackelberg, 1926*''Scellus sinensis'' Yang, 1998*''Scellus spinimanus'' (Zetterstedt, 1843)*''Scellus tshernovskii'' Stackelberg, 1951*''Scellus varipennis'' Van Duzee, 1925*''Scellus vigil'' Osten Sacken, 1877*''Scellus virago'' Aldrich, 1907
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