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Hi Morten, it should be magna indeed: the green stripe on parafrontalia and the green femora are perfectly visible! And compared to my viridis the mouthedge seems to be distinctly protruding. This one seems to be very rare (and not in Norway according to fauna-eu).
EDIT: The mouthedge is not as prominent as it should: https://diptera.i...to_id=5809
Probably a female viridis...