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This is either Chlorops or Thaumatomyia. I'd vote for Chlorops, because:
Thaumatomyia: scutellum flat and gena about half as wide as the third antennal segment is deep (lateral shots of the head are important to show the narrow gena);
Chlorops: scutellum rounded with no rim, gena wider related to width of third antennal segment, body usually less shiny and more dusted.
(Cp. discussion in http://www.dipter...ropid.html.)
I add a picture for comparison.
Regards, Sundew