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So. I'm not sure but if the abdomen is greyish dusted should be G. caesius (Mg.). Long cerci are visible so maybe it is this one. If not so maybe. G. spectabilis (Lw.) (with reddish abdomen) but first flagellomere and the number of dorsolatersl bristles (4-6?) on hind femur look like the first species B)
Andrzej