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You are right, I was too fast 10 years ago :S At that time, I relied on the identification of my fly in https://diptera.i...d_id=14356. It is the same species as yours, and meanwhile I found out that it is Rhagoletis alternata indeed. But I forgot that I transmitted the wrong identification to you...
So I support Rhagoletis alternata now! But please try to get bigger pictures that show more details, e.g. like this one: https://diptera.i...pid=287945
Regards, Sundew