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Hello
Rozkosny (1984)'s character of wing venation is unreliable if you look at a broad geographicall scope; for identification you should definitely check Kassebeer (2002) :-)

Based on the pictures it is definitely Psacadina, but not possible to identify to species. The general impression of color indicates P. zernyi though. Again, without better pictures not possible to ID a species here, so definitely a guess based on experience.

And last: Psacadina verbekei has not been found in Finland yet, but i am most certain it does occur! Psacadina zernyi is common in Finland (well - I've seen a lot of material in collections from Finland)

Finally, some promo for a recent paper of mine https://www.researchgate.net/publication/348133411_Review_of_Psacadina_Enderlein_Diptera_Sciomyzidae_with_the_description_of_a_new_species_from_Southwest_Europe
It involves a nice map, to see where you might expect P. verbekei

wishes