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For me, it's a solved case. Considering the image provided by eklans, in this species (which is absent where I live, in southern Europe), the male has a venation with the Rs vein shorter than r-m (which I call the ‘anglicus’ type), whereas the female has the Rs vein shorter than r-m (which I call the ‘hortulanus’ type).
This contradicts what Duda's key (1930) says for the female. This characteristic is not used in other keys.
I will update that in the wiquipedia comment.