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Many thanks for all the explanations! I add some detail magnifications of the parts mentioned; maybe, the ID thus becomes more certain. The frontal stripe of the female is brown, the male's is black. Jari's Senotainia albifrons seems to have longer bristles and hairs (http://www.dipter...d_id=31141), mine "shows more skin". Nevertheless I would add the couple to the gallery under S. albifrons, or should it better be with "cf."?