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Diapheromera femorata
I've moved this to the Arthropods category for you. Please consider the following mission for all your Oklahoma spottings:
http://www.projectnoah.org/missions/7959...
Great find! These are the most common species of Phasmid in North America. You can tell yours is a male because of the claspers at the end of the abdomen (the little pincer looking things).