Here is what I use to study. It is a side by side from NABA with lots of same angle photos for each (side by side); http://www.naba.org/chapters/nabambc/frames-2species.asp?sp1=Polygonia-interrogationis&sp2=Polygonia-comma :)
I know how you feel. I spent a lot of time on getting it right between the Comma and the Question Mark but I had the shots of the caterpillar and it was fresh out of the cocoon so I was pretty sure of my ID. Thanks for the Fav.
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