I’m guessing you might be asking yourself, “What’s up with the title of this blog post?” It must be either a typo or mistake, right? No, it’s another case of acceptable uncertainty.
The following butterfly is either an Eastern Comma (Polygonia comma) or Question Mark (Polygonia interrogationis). I can’t tell the difference between these two species unless I see the distinctive punctuation marks that appear on the underside of their wings. In this case, I saw the dorsal side only.
Some naturalists say you can differentiate Eastern Comma and Question Mark by their relative size, but hey, they’re so similar in size I think that field marker is useless unless the two species are side-by-side.
Editor’s Note: Thanks to Michael Powell for identifying the butterfly featured in this post as an Eastern Comma. For details, see Michael’s comment on the post.
Copyright © 2017 Walter Sanford. All rights reserved.