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This is a male of either G. tripunctata or G. nartshukae. The reddish thorax would point to the latter, but unfortunately the coloration of the thorax is very variable in the G. tripunctata. It seems like especially in Southern Europe, the thorax tends to be more reddish brown, but I see more and more specimens from the Netherlands which also have a rather reddish brown thorax. To be sure the genitalia should be studied.