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Dear Johanna,
Though I studied thoroughly your drawings of leg chaetotaxy in a former thread, identifying the position of the bristles remains a crux. I add some views of the hind tibiae from different directions, but the av setae are not clear, to me they could also be ad. The view from behind is especially puzzling, but the two left pictures show at least 2 setae - is your eye keen enough to discriminate between av and ad? Otherwise the fly remains Lasiomma spec.