---

Hello Benoit,
There are a few differences between this one and Syrphus sp. The first and most important one is the curved vein R4+5 in the wing (as in Eupeodes lapponicus), in Syrphus this vein is straight.
Second, the shape of the spots on the abdomen is typical, with the curved spots on segment 2, and the bands on 2 and 3 with the typical 'bite' out in the middle.
Third, but maybe not so visible in the picture is the dark, shiny thorax, in Syrphus this is more green/yellowish and dull.
Last but not least, the species has a black spot just above the antennae.
These are the most obvious differences!
Greetings,