According to the Connecticut Audubon Society this is a Hummingbird Clearwing Moth. We see these interesting insects collecting nectar around the garden. They are large for an insect and small for a hummingbird. The lunch al fresco debate has been resolved.
To be fair, the little legs that are visible in the photos were not visible to the naked eye and the wings move so quickly they are a blur. In the photo we can see why they are called “clearwing”.