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Hi,
Found in a desert area need artificial lake. Eristalinus?

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Syrphidae. Somewhere Eristalinus sepulchralis

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Thanks Jorge,
Did you excluded E.aeneus ?

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this is E. aeneus....male, eyes meet in front
Amalia

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Thanks Amalia,
Can you explain the separating keys between E. aeneus and E.sepulchralis?

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for the males it is easy: like i have already told you on E. anaeus' males the yes meet on frons and E. sepulchralis' eyes don't. also a criteria used also to identify males and females is the presence of the hairs on the eyes: on aeneus the eyes are hairy on the upper surface only and bare on the lower, and on sepulchralis the eyes are all hairy.
in the field, anaeus has a more elongate body.

Amalia

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Amalia, thanks very much for the nice explanation