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Mantis religiosa
Brown, and about 2" long
Pennsylvania grasslands
Found on a feed bag in our shed. I've never seen a brown mantid before, but upon further reading have found that it is common.
Cool find! Please consider adding this to the Marvelous Mantids of the North East mission: http://www.projectnoah.org/missions/1573...
I think this may actually be a Chinese Mantid nymph. You can just see the green edge on the wing buds that haven't fully formed yet. Here is another one that looks like yours:
http://bugguide.net/node/view/209428