The answer is.........

Clearwing Hummingbird Moth

According the webpage http://www.fcps.edu/islandcreekes/ecology/hummingbird_moth.htm



The Hummingbird Moth, unlike most moths, is seen on clear, sunny days. Many people do confuse it with hummingbirds because of its coloration and how it moves.

Hummingbird Moths grow up to two inches long. They have an olive-green body with red bands across their abdomen. Tufts of hairs from the end of the abdomen look a lot like feathers. The wings of this moth are mostly clear, sometimes with some red near the body.



Hemaris thysbe, the Hummingbird Clearwing Moth or Common Clearwing (wingspan 38-50 mm), readily visits flowers by day throughout the eastern half of the U.S. and Canada, where it ranges far to the north, even into the Yukon. It is not difficult to see why many gardeners would mistake an Hemaris thysbe moth for a small hummingbird as it hovers, sipping nectar from flowers through a long feeding tube. The moth hovers briefly, sipping for only a few seconds before darting off to a new flower. Green body "fur" and burgundy wing scales suggest a small ruby throated hummingbird



Adult Hummingbird Moths feed on nectar from many different flowers, just like hummingbirds. Some of their favorites include: Japanese Honeysuckle, Red Clover, Highbush Blueberry, thistles, wild roses, and blackberries.

Hummingbird Moths use a long, thin, needle-like mouthpart called a proboscisto eat. The proboscis stays coiled up like a garden hose until it is time to use it. When the moth approaches a flower, it uncoils its proboscis and dips it deep into the flower where the nectar is.
Predators of Hummingbird Moths include birds, mantids, spiders, bats, and other moth- and caterpillar-eaters, although they probably get some protection from looking so much like hummingbirds.

And now you know - I've never seen such a thing!....................................Jo