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Many thanks, Eric,
I hadn't come across this genus yet and I imagine that on my other subject https://diptera.info/forum/viewthread.php?thread_id=112593 it's a female of the same genus?
I see that the male Melangyna quadrimaculata has 4 spots on the abdomen. Here, there are indeed 4 main spots and the other 2 small spots towards the base are very discreet and should not be an obstacle to identification.