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Thanks Theo for your answer.
In direct comparaison with my specimens of rusticus I have some differences :

Head :
- first antennal segment more than 2x long (less in rusticus)
- black hairs on first segment very long (shorter in rusticus)
- subcallus dark in this specimen (orange in rusticus)
- facial ridge with long black hairs (only pale hairs on rusticus)
- palpus and clypeus with long black hair : really disheveled
- eyes with larger upper facets
- angle between eyes much larger (but not enough for species with angle > 100 (90° here)

Legs :
- front femur with very long black hairs, and only black hairs (shorter and pale in my specimen of rusticus)

Haltere brown

But I think this specimen was in alcohol so maybe the identification is more difficult.
If the tubercle on vertex is always present in Hybomitra (I think so, according to several picture in internet), so it's not Hybomitra. But head is too dark (hairs, eyes, face) for rusticus ?