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I haven't any idea about this. I just sure it's a tachinid. Isn't it ?
Thanks
EDITH
Near Paris, august 15th

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Carcelia sp?

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I agree

Carcelia is a difficult genus. Given the colouration, number of discals on tergites, ad on tibia 2, dusting on tergites, etc., I'm inclined to think this is the female of Carcelia lucorum. Host in Arctia and other Arctiidae, most common (or least rare) in later summer, so that figures.

Theo

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Thanks Susan and Theo.
If I could, I put it in the gallery