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Andre is right !
If you look very closely, you can see a row of spines in the middle of tibia 1. Out of focus, but it is there.
This means it is a Dilophus after all.
Three species are candidate: there is no way to tell which it might be.
Unfortunately, since all three have been recorded from the dune area.
The size (about 10 mm.) is most likely somewhat exaggerated.

Theo