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Thanck you very much Tony, I was totaly lost. After some research, I found Trixoscelis marginella (I had collected a specimen).

References :
- WALTER HACKMAN. Trixoscclidae (Diptera) from Southern Spain and Description of a New Trixoscelis Species from Northern Europe. Ent. scand. 1. 1970. 127-134.
- ANDRZEJ J. WOŹNICA. The female postabdomen of five species of Trixoscelis RONDANI 1856 (Diptera: Trixoscelididae). Dipteron. 31 XII 2014. Tom 30: 99-105.

thank you again,

Pierre-Yves