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Hi!! Your Eristalinus is indeed a female, the species is Eristalinus aeneus.

There are 4 species of Eristalinus in Western Europe.

- Eristalinus taeniops: unique, striped eyes.
- Eristalinus megacephalus: unique, spotted eyes and abdomen with orange areas.
- Eristalinus aeneus: difficult to separate from E. sepulchralis, but males have eyes joined together (separated in sepulchralis) and females have eyes completely bare in the lower part and shiny bronzy abdomen.
- Eristalinus sepulchralis: much smaller (average) than aeneus, both sexes have separated eyes but both have very hairy eyes.

Hope this helps :)