There are only four Myopa species in eastern N.A., M. clausa, vicaria, virginica and vesiculosa. This is M. clausa, as it's the only all-red species east of the Rockies, as well as having clear wings (unlike the other three eastern spp.) and semi-circular patches of very fine white hairs on each side of several abdominal segments. M. vicaria would have visibly darkened cross-veins, a distinct white 'beard', and long black hair on the thorax.