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I agree with ForestDragon it's the Banded Sphinx Moth (Eumorpha fasciatus)...! http://bugguide.net/node/view/597408
Great find! The patterning on the wings looks closer to the Banded Sphinx to me. Here is an image of a White-lined Sphinx for comparison. http://bugguide.net/node/view/966258
Check out the link I provided in my ID suggestion as well and see what you think! :-)