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In his keys published on web, Mister van Veen for the selection of Cheilosia rufumana in the groupe C. proxima at couplet 2a indicate for selecting C. rufimana that les Frons is completaly dusted; lunula yellow >3
and at couplet 3 add : "face mostly dusted;sternites with dull brownish dust > Cheilosia rufimana.
If not this choice then > Cheilosia uviformis (which has an orange third segment on antenna ...
So I add picture I discover of the lunula , picture were very dark so I had to light them ...





Have a good day !