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Hello Maherjos,

The M shaped black shiny mark is a feature of the genus Desmometopa. There are six European species. Sabrosky 1983 reviewed the world species.
You can find teh article here: http://diptera.myspecies.info/content/synopsis-world-species-desmometopa-loew-diptera-milichiidae

Greetings,

Ectemnius