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Ansbach, 2024-03-18, old shed in garden near old deciduous forest in Frankenhoehe Nature Park.

I think it's a female Mycomya marginata based on:

http://www.spessa...inata.html
https://eskoviita...nata_e.htm

Rauno Väisänen (1984): A monograph of the genus Mycomya Rondani in the Holarctic region (Diptera, Mycetophilidae)

- scutellum: 4 bristles, Tergites dark brown, posteriorly yellow: