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Andr? - not being familiar with this fly, I looked at the pics and thought the gold was either dusting or pubescence intermingled with longer dark hairs - rather as the close up reveals. Now that I have looked it up, I note that Stubbs does not mention this character in his description at all, nor is it indicated in the illustration in British Hoverflies. However, there is a trace of similar gold if you look closely at Tristanba's images in the gallery. Perhaps these hairs are like Pollenia's and wear off very quickly.