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Stephane, I can't see any possibility except for H. irritans: densely grey dusted body (thuogh well may be much less dusted as well); a pair of elongated prst ac just before suture; f2 with at least 1 ventral spine visible; f3 with strong av only in apical 1/3; f3 and t3 only slightly curved. End of July and on flowers also fit good.