Could be this moth.

http://bugguide.net/node/view/16273

No, it's not Hypoprepia, it Tyria jacobaeae, a moth released for the biological control of the weed tansy ragwort.

*moth, not a butterfly. If it's got little furry antennae, it's a moth not a butterfly.

http://blossomdaily.files.wordpress.com/...

:)?