S. grandicornis has dorsolateral yellow stripes on the thorax and yellow postalar calli which are absent in M. viridiceps; tergites 5+ have a distinct banded appearance in S. grandicornis, where T6+ are not readily visible in Melangyna viridiceps (or they're not present?)
Michael, I go by the 'dorsolateral stripes' that James mentions, on the sides of the thorax. S. grandicornis has larger yellow blotches on the abdomen, and is a slightly larger and more robust insect than M. viridiceps, although of course the size difference is not detectable in most of the images.
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