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Markus -
The bristle colour on the front and mid femora appears to rule out cothurnatus, leaving just socius and cyanurus as candidates in your area. The females of these two species are pretty well inseparable, except for the distribution of microtrichia in the first basal cell of the wing. If you have a very detailed dorsal shot, showing the wing microtrichia, we might be able to make a decision, but I don't think we can work with a lateral shot.:(