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Hello,
i don't speak english fluently and discover your forum, so forgive me if i start awkwardly.

I am looking for the identity of this dipteran, and despite the help of entomologists on Twitter we have not yet found.

thank you in advance for your proposals

Sophie

Geneva, switzerland, on a window

https://twitter.com/capuchenoire/status/1279453693381955584?s=20