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but lateralis (Macq) is in subgenus Poemyza (4 scutellar bristles, small round ist flagellomere). I am not saying your fly is affinis, just that it is close, affinis does indeed have some yellow on scutellum. looking more closely through Nowakowski and at your photo i think it is a species not in that key, ie described since 1973 or an undescribed species.