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Polistes spp.
Riparian
I believe you have the correct genus Shannon, but the yellow lines on the thorax make me think it may be a different species.
I just found one of those as well, I think even on the same type of flower! Our spottings are close to each other, so they are most likely the same thing. Here's the one I found Friday:
http://www.projectnoah.org/spottings/141...