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Mecaphesa asperata
I think this is more likely M. dubia, because of the multi-tone abdomen. M. asperata more commonly has the wide longitudinal bands on the carapace, but I did find one M. dubia that did as well:
http://bugguide.net/node/view/525808/bgi...
BTW, I'm the go-to guy for the flower Thomisids on BugGuide -- they rely on my findings to make their determinations.