Question Mark

This is a Question Mark. You can actually tell more easily from the upper markings than the 'Comma/QM' below because those marks are often obscured or worn.

To identify, Comma has three dots on the upper surface of the forewing while QM has 3 dots and a dash. Scroll down to the third picture in the link below and hover your cursor over the picture to see this feature.

http://rlephoto.com/anglewings/mark_ques...

Sorry about the confusion on the scientific name. Nice spotting Sarah!

Please excuse my being picky.
The Questionmark is Polygonia interrogationis
The Eastern Comma is Polygonia comma

This is one of the "punctuation mark" butterflies -- either a Comma- or Question Mark butterfly. Did you get a look at the underside of its wings, where there are white marks that are definitive characters in the shape of either a comma or question mark? Related Resources: 1) Comma http://www.projectnoah.org/spottings/119... 2) Question Mark http://www.projectnoah.org/spottings/123...