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I have study again the Key and found out , that there are indeed more species with more ore less yellow calli + tip of scutellum+ abdomen.
And also more species within that group with the tarsen more or less expanded.
(Pegomya winthemi / furva / circumpolaris / fulgens / transgressa)
So there are more specie possible, instead of what i sad before...
I found yesterday evening problaby a Pegomya winthemi myself (Photo ) and indeed we can see the nicely the hind tarsi laterally expanded.
But....about your photo's, i think with the knoledge i have now, i find it difficult to say more....:@
But i have learned much more and hope for you also....:)

Greatings Joke!