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Hello,

Judging by external characters the fly in question should be Sapromyzosoma quadricincta, but the genitalia don't fit. At least I can't make them fit the drawing in Shatalkin. There's a kind of resemblance though ...
It has a pair of black spots on T6 and three preapicals on t2 (one dorsal and two ventrals) and only one of the ocellar bristles is located inside the ocellar triangle, curiously enough.
If it isn't quadricincta then what are the options?

Caught in a light-trap, Denmark, May 2022.

All the best,