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I first thought Bibionidae when I looked at this fly. Looking through the forum posts about that family I came across a photo of a fly with similar thickened foreleg, an Empidid. I wouldn't have published this sucky photo if it weren't for the special foreleg ... Is it possible to tell if this is Hilara sp? What ever is the fat leg used for?

From midwest Sweden 2006-05-26 (YYYY-MM-DD).