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These trusty blue eyes say: Ectopsocus. It is an old nymph of the last stage, a teenager, looking already quite adult. Only the wings are still underdeveloped, but the hairyness of the forewings is already well visible. The frequent E. briggsi and E. meridionalis are the candidates (see http://www.pbase....e/71007497 and the third picture of E. briggsi in https://www.brc.a...llery.aspx). E. californicus has the orange W on the head (http://nathistoc....rnicus.htm) but does not occur in Germany. Sometimes it is mixed up with E. meridionalis. So I would say "Ectopsocus spec." in this case.
PS: Here is another American website with nice pictures, saying that E. briggsi and E. californicus look very similar - http://socalfauna...hp?id=2504.