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Hello Benoit,
This is a syrphini allright, but not a Syrphus sp.
The thorax is very shiny, suggesting a species of Epistrophe.
In this case I think it is a female of E. melanostoma, allthough one should look at the color of the hairs on the scutellum to see the difference with E. nitidicollis.
Greetings,