Sphinx chersis
Here is another link from your angle:
http://bugguide.net/node/view/552210/bgi...
I can't be sure with out a dorsal shot, but it looks like the Great Ash Sphinx to me. Maybe you can check the link out and see if it is the Great Ash Sphinx.
Lat: 42.36, Long: -75.14
Spotted on Jul 12, 2012
Submitted on Jul 13, 2012