Hemaris thysbe, or the Hummingbird Clearwing, is a moth of the Sphingidae family. It lives in Alaska and the Northwest Territories south through British Columbia to Oregon; east through the Great Plains and the Great Lakes area to Maine and Newfoundland; south to Florida and Texas.
Adults are frequently mistaken for hummingbirds or bees because of their fast-moving wings and coloration. They have a two inch wingspan.
Source: en.wikipedia.org/wiki/Hemaris_thysbe - 07.12.2011