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Xenox tigrinus
A large fly.
Sitting on a cucumber plant.
The wing pattern is different (less speckled than anthrax, more like the coloration follows the wing veins), which is why I think this is a Xenox species. X. tigrinus is the only one on bugguide that looks like yours to me and whose range includes your area http://bugguide.net/node/view/2803