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Hi All,

The flies of Eguzki are clearly males of Eristalinus aeneus.
The fly of Pierre is a clear female E. aeneus.
And the last ojne is indeed a male E. sepulchralis.
The habitus of both species is entirely different, especially in the males. In E. sepulchralis the first two tergites are dull in the middle, whereas in E. aeneus they are all entirely shining.

John