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In my collection too (some verified by Adrian Pont:p) it is subventa though it's called variegata (Meigen, 1826) the old but not older name for Phaonia subventa (Harris, 1780).Very narrow black bands. I'll try for photographs to illlustrate both of Kahis very well observed characters especially the abdomen bands.Only some specimens have the dark median stripe mentioned by Susan which I too thought might be a character. These flies are very difficult without chaetotaxy (see glossary soon).
Robert