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thank you Theo,

just for the little details: ;)
Looking at the single, long and strong bristles on the frontal head (pic 2,3,4), I thought this was a male? Picture 4 got a false (flashlight)shadow on the head, so singlehairs may look double?

The other fly(on pic 5), could be male too? (not developed completely)

I'll place two detailes pictures of the frontal heads of the two flies underneath:

fly 1)