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Sphinx franckii
Large moth in the late afternoon, about 2.5 inches long ... almost didn't see it because it was so nearly the same color as the sidewalk.
BugGuide:
http://bugguide.net/node/view/35566
Another spotting, same species:
http://www.projectnoah.org/spottings/668...
Definitely S. franckii in my eyes. Super find! I would love to see these. Sphinx moths are my favorite.
I'm going to double check my references, but I don't think it could be mistaken for anything else. Sphinx franckii is a very (!) infrequently recorded species!