Anglewings are all over the Indiana woodlands this time of year and they will pause for a picture better than most butterflies.
I'm thinking that this is probably a Question Mark, although I can't really be sure unless I harass the butterfly and capture it to examine it more closely. I was satisfied with just the picture. (I'll leave it to an expert to identify by the picture and make this truly a "question mark" for me.)
My Audubon guide states that the butterflies can get intoxicated from drinking fermented fruit. Next we'll be hearing about butterfly AA (BAA.)
This is another butterfly that uses those dreaded nettles, in addition to elm and hackberry, as a host plant.