This came fluttering into my face at work yesterday.
It's an adult antlion if I'm not mistaken. (Am I mistaken, scientists?)
It calmed down when I gave it a stick to perch on.
Sorry I took so many pictures--all my life and I've never seen one before.
Apparently they're nocturnal, and on the right background they're pretty hard to see!
See this post for more on antlions.