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Many thanks, eklans!
It was fairly large, but in the same place it was a male (not photographed) that was really tiny.
I've readed somewhere that the species that flies in March is gratus, incisus flies later in the year and not before April (for Spain). And this year has been especially cold and rainy. Still is incisus the best candidatus? I've also readed that there are differences in pilosity of face and thorax and curvature of th tip of the vein R4, but I neither have found info about what are these differences, not see them in image comparisons.