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This small fly was near Chicago attracted to some deposition on a fence. ~ 3/16".

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It is the same or very close to the one on Bugguide.net (http://bugguide.n...view/16461). The suggested name there is Thaumatomyia. Searching a little further I stumbled on the Cedar Creek site and the give a resembling picture of Thaumatomyia glabra at http://cedarcreek...037ap.html.

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Thanks very much Paul. It looks very much like that one.