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Dear Juergen

I've changed my mind! I now am sure it is a male of Lasiomma strigilatum Zett. (Anthomyiidae). The hind tibia are as in this species, and I think (?) I can see some pale hairs on the eyes, which this species has. Also two pale vitta just behind the head, not running past the suture. L. strigilatum breeds in bird nests, and is common early in the season.