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Hi Finaly,

Well, it's an entirely black Sepsidae with no wing spot. That coupled with the habitus and the typical armature of the front legs' tibia and femur.
After collecting about a thousand specimens in the Netherlands and publishing four species new for the fauna I can say, no other North-Western European Sepsidae have such a habitus.
https://www.resea...a_Sepsidae

Kind regards,
Ectemnius