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Wout Opdekamp told me that the colour of the tarsi in aenea is much less dark than in my specimen.
He looked at all the aurata he has in his collection (>20 from different countries) and there is a little variation in the pruinosity and the length of the hairs.
He consulted Frank van de Meutter (another specialist of the Syrphidae) who confirmed the identification as aurata.

Christine