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There is no elongate posteroapical seta on the mid tibia, ruling out Leptocera nigra. This is either Leptocera caenosa or Leptocera fontinalis (based on the key to European Leptocera in Rohacek (1982)), I'd be inclined to say L. caenosa since the arista appears to be fairly long-haired but the palps or terminalia aren't visible to confirm.

Gregory Kuwahara at https://www.inaturalist.org/observations/65528643