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Toxomerus marginatus
Identified by the round spot near the end of the abdomen. Family Syrphidae.
Lawn.
T. geminatus also seems to have more of a detailed pattern in the middle of the abdomen:
http://bugguide.net/node/view/774944/bgi...
T. geminatus has too many abdominal lines. Sorry for making a suggestion, I didn't see your "Notes."
http://bugguide.net/node/view/8222/bgima...
Incidentally, do you know how to tell apart T. marginatus from T. geminatus?