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Susan (Walter) commented on another image: "I think it would be possible to mix up V pellucens and Leucozona lucorum if you were a beginner."

I'm one of those beginners. L. lucorum is reported as being introduced into North America but V. pellucens has not - but things do change!

This fly appears to be L. lucorum; 13 July 2007, New Brunswick, Canada.
Confirmation or not appreciated;)