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Hello ! I'm sorry, I'm only recently registered on this forum and 'discovered' this observation. I just published an article about the discovery of Psila helvetica in France (well Darwyn ;) ), if I had known I would have quoted this mention.
https://www.researchgate.net/publication/363659087_Note_on_Psila_helvetica_Shatalkin_Merz_2010_a_new_rust_fly_Diptera_Psilidae_for_mainland_France_with_key_to_French_species_and_male_genitalia_illustration
Psila helvetica is therefore known from Switzerland, Austria and France (and that's all, not Finland as falsely stated).
Do you still have the specimen? Could you send it to me for study?
All the best!
Jocelyn