We had an invasion of these small (<5mm) flies in the house in Crete in March. The lengthwise stripes on the thorax coupled with the banded abdomen would suggest Helophilus but they tend to be black and yellow. The pterostigma seem distinctive too. Anyone any ideas?
I can't tell you much more than they're not Helophilus (Syrphidae). Look like some sort of Tephritid, possibly. For future reference, most (all?) Syrphidae have a "false margin" on the wing. Helophilus, so far as I'm aware, tends to be a relative large, hefty fly, along these lines: