This is a new one to me. I found a fat, hairy caterpillar a few weeks ago and put it in a container with a good bit of soil and some leaves. It pupated within a couple of days and today when I checked I found I have a white moth with irregular black-edged gray spots (a friend exclaimed that it looks like an Appaloosa!). It is about 1 1/2" long, wings folded over its back. I live in SW PA, surrounded by a wooded area with cherry, tulip poplar, oak, elm, maple, etc.

Can anyone ID this for me or direct me to a suitable site to help? Thanks! CK