Thanks for fowarding your moth picture. You are correct that it is a sphinx moth, however, it is a Walnut Sphinx Moth, not the Blinded Sphinx as you initially thought. Click here for a BugGuide.net link with more information on the species. And while you are on BugGuide, type Blinded Sphinx Moth in the search box and take a look at the markings so that you can compare the two! -Naturalist Linda Gilbert