visitors in the lilacs

Tonight Loren and I though we'd spotted a hummingbird in our lilacs from out the kitchen window.  It was moving like a hummingbird, and had the same rapid wingbeat while it zipped all around...so I grabbed my camera to snap some pictures of our first hummingbird sighting of the summer.  To my surprise, when we looked up close at the pictures it turned out to be a moth.  A quick google search informs us that this is a sphinx month, and strangely, it seems to most resemble the White-Lined Sphinx Moth Hyles lineata.  If true, than it is a rare sighting indeed--they aren't supposed to be this far north.