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Melanoplus bivittatus
Relatively large, smooth, usually yellowish and brown (sometimes greenish or blackish) with two distinct pale yellowish stripes along sides of top. Male with cerci roughly boot-shaped. (information from BugGuide)
Tallgrass prairie
This spotting took place at the Tallgrass Prairie Preserve.
Acrididae, Melanoplinae, Melanoplini and most probably one of the many Melanoplus sp., sorry, I do not have the time before Xmas to check all the candidates carefully. Maybe you find some time during the holidays.
Merry Christmas and Happy 2014!
Oh, I forgot you need all time for your foxy wall picture ;-)...