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Wellcome back with nice fly Jorge.
Well, it is male, so we have to find species level ID.
There are two possible candidate as far as I know Sepsis lateralis (a Sepsis without black apical spot on the wing) or Austalosepsis niviepennis. Both species are possible in Portugal.
On one hand it seems that cells br and bm on the wing fused, which lead us to Austalosepsis niviepennis.
On the other hand f1 and t1 and general appearence are for Sepsis lateralis.
I think that more probable that cells bm, br only looks fused and it is
Sepsis lateralis.
Nikita