Tiny flies (2 and 3 mm) that in common with many of the family have more sexual dimorphism than most of the Diptera. The rear extensions are the hind legs of the smaller male. Normally these flies are seen singly, scuttling around leaves in the evening feeding on honeydew and other leaf deposits. I saw this scene briefly some years ago, failed to get a clear image, and have been waiting for another opportunity.
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