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No doubts, O. parietina. Central Europe has 3 species only, and May is the season for O. parietina, which oviposits into young shoots of Artemisia vulgaris. The females of other two species have very datk wings with less small yellow dots,
The body of fresh specimens looks ash gray due to whitich microtrichia, but this specimen is greezy (and has some setae broken), but I rely on the season and wing pattern. The 3 species also differ in the shepe of ovipositor aculeus shape (seen at 40x of a compound microscope).