---

I checked for Chyromyidae, but it seems this does not match. Indeed, in 'The European Families of the Diptera', Pjotr Oosterbroek says that this family is characterized by yellow (here black) bristles and hairs and by the lack of dorsal preapical bristle on the tibiae (here they are present). These specifics are also mentionned by John Carr in this forum.
Species from Chamaemyiidae are usually silvery grey flies (not exactly the case here) and they also lack preapical bristles on the tibiae.

I will keep searching, thanks in advance for any hint!