Large moth -- probably a Pachysphinx modesta, aka Big Poplar or Modest Sphinx

This fellow was apparently just resting, on my front stoop in Casco (Maine) Friday afternoon. He adopted this slightly aggressive posture when prodded (to see if in fact he WAS alive!). Quite large, and I've never seen one like it before, here..... I'd love to know what species this is!

 

I think it is some variety of Sphinx Moth or Hawkmoth, but which, exactly?? :-)

 

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Taken on July 4, 2008