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This is Norellisoma spinimanum.

I am finishing a paper on Norellisoma right now. This paper will have good habitus pictures (lateral, head, sternite 5) of all 6 Belgian species together with some interesting details on synonymies or whatsoever. I should try to submit it soon.

Ball's key is very bad for Norellisoma, so please do not rely on this. Unfortunately, indeed, one has to gather plenty of (mainly inaccesible) papers to identify Norellisoma.
But after a while, identification come easy since, especially males, are really striking.


About identity of N. spinimanum, I give you one paragraph of my publication to come:
Ozerov (2010) provided useful images of the male genitalia, and Šifner (1995) provided drawings of male and female genitalia. This species might be confused with N. alpestre (Schiner, 1864) and N. jeliniki Šifner 2008, both of which have a yellow thorax. To separate these, Šifner (2006) provided a short summary of characters of these three species (mainly wing venation, male genitalia and the shape of sternites).
Anyhow, together with distribution you do not have to doubt about N. spinimanum.