I think this is a rather nice looking moth. It has a wingspan of about 1½ inches. When I found out it is named Horrid Zale, I wondered what would make someone give it such a name. Here’s the explanation from the website bugguide.net.
The German entomologist Jacob Hubner, 1761-1826, named this species. A naturalist, John Himmelman quotes a friend, Eric Metzler, on the origin: Latin "horridus" (adjectival “horrida”) means "standing on end, sticking out, rough, shaggy, bristly, prickly.” Aha! So Hubner did not think this was a horrifying moth at all! “Horrid” means "bristly" and refers to the bristles on the thorax.
I was glad to read that because I didn’t think it looked horrid at all.