I don't know what they are but we have them in SE Michigan...never shot one though.Would be interested to know your settings though.
Sphinx mothhttp://www.flickr.com/photos/jean-jacquesboujot/5018941930/
Or (Eric, take note), the hummingbird hawk moth. Thanks, Frank.Jeremy
Isn't it a darn shame that insects won't take the photographer into consideration when flying around searching for food.
That is a really interesting critter. Great job capturing the little guy in flight. The composition isn't a strength of the image, and the "grain" (noise) in the background bokeh is distracting to me.