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Hello,

A Culicidae found in North of France, at Zuydcoote, the 06 June 2021, in early morning, in a densely vegetated area, on slighlty sandy soil
Maybe also an Ochlerotatus near annulipes ?

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2nd picture

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3rd picture

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4th picture

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last picture

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I'd agree - Oc. annulipes group. I find separating annulipes and cantans very tricky.

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Thanks you very much, Tony !

I wonder what are the key caracteritics for separating these two species (if there are any)

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The usual characters are the colour of the pale scales (yellowish or whitish) and the length of the pale band on the hind metatarsus (1/3 or 1/2 - I regularly measure 5/12!).
Other characters are difficult to see in photos, and with specimens, they need to be in good condition. The males are more easily separated using genitalia characters.

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The scutal pattern looks good for Aedes excrucians. To positively ID that species you need a closeup of the claws though...