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Kim, sorry but I must disagree.
I believe this is an adult female Carolina Mantis. Some differences that can be seen with this mantis vs a European Mantis are the wings, head shape and thorax shape. The short wings with the small spot are consistent with female Carolina Mantises:
http://bugguide.net/node/view/720514/bgi...
http://bugguide.net/node/view/473933/bgi...
Female European Mantises:
http://bugguide.net/node/view/697253/bgi...
http://bugguide.net/node/view/589832/bgi...
http://bugguide.net/node/view/437957/bgi... (just for face shape)
Carolina Mantises have a thinner thorax. They have somewhat "buggy" eyes (they bulge out more). Their abdomens are shorter and wider in the middle than European Mantises.
Stagmomantis carolina is a native species.
Hope this helps!