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With permission of the author Wolf-Harald Liebig I present the attached photos. He photographed the fly on 23.08.2012 in the immediate vicinity of the Muskauer Landscape Park with its remarkable old trees (Bad Muskau, Saxony, Germany).
I think it is Callicera macquarti: short antenna segment 2, no black hairs on abdomen, hairs of the scutellum of the same length as the scutellum and no longe than antennal segment 1. Am I correct with the determination?
Best wishes
Matthias Jentzsch