Do you have any additional views of this caterpillar? I agree that this is a "hornworm", a sphinx moth caterpillar. It is a different species than Manduca quinquemaculata. M. quinquemaculata has eight V-shaped stripes. This caterpillar has seven diagonal stripes. http://bugguide.net/node/view/5011
This one reminds me somewhat of a Rustic Sphinx, Manduca rustica: http://bugguide.net/node/view/3774
However, I would need to see the head and the horn to be more certain.
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