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Polygonia interrogationis
about the same size as a painted lady
in my front yard
When the identifying mark on the underwing is too faint or not visible, then this side by side comparison of the Eastern Comma - Polygonia comma and Question Mark - Polygonia interrogationis is very helpful. http://www.naba.org/chapters/nabambc/fra...
You can barely see the Question mark marking, but it is there in the lead image
Question Mark butterfly is my best guess - http://www.whatsthatbug.com/2009/07/31/q...