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Unknown caterpillar - Question Mark? - Polygonia interrogationis

Unknown caterpillar - Question Mark? - Polygonia interrogationis
Evanston, 424 Dewey Ave., Cook County, Illinois, USA
June 9, 2010
On Elm Tree leaf


Moved from ID Request.

might be Question Mark Butterfly cat
Polygonia interrogationis

Thanks, that's probably what it is.
It certainly looks like that's what it is and you have some very fine photographs. Thanks for the help

We're growing hops plants to attract question marks and one came by a few days ago investigating it. Perhaps it chose the elm tree instead.

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