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Thank you very much, I greatly appreciate your continuos help!
Not many Thyridanthrax spp have hyaline wings, so I completely forgot about them while searching for the ID of this sp.
But I learned something about the importance of antennal shapes...

Anyway, Thyridanthrax lotus is a more exciting sp. than Exhyalanthrax muscarius :)

I attach a not very good picture of a fly, which, based on your picture, might really be E. muscarius :)
Kind regards,
Henrik