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Je m'excuse!

Anthomyiidae: Medial vein not curving forwards.
Muscidae: Medial vein curving forwards in a limited number of genera. Of these, only Neomyia is metallic green, but its species are really shining and without fine dust layer (and generally the antennae are held to the face rather than projecting).
Tachinidae: As far as I know there are only two genera that can be mteallic green, Chrysosomopsis and Gymnocheta and in these species the medial vein almost closes the cell anterior of it and the abdomen is strongly setose.

Hope this helps.