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Stagmomantis carolina
Green Mantis found in a garden.
This is a beautiful spotting! Your Mantis is actually a native species, Stagmomantis carolina. Here are a couple that looks like yours:
http://bugguide.net/node/view/604559/bgi...
http://bugguide.net/node/view/451918/bgi...
You can see the distinctive spot on the wings and the length of the wings (they don't cover the abdomen).
Sphodromantis viridis, also known as the Giant African Mantis, doesn't occur in North America and has a different body shape.
Hope this helps!