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Photo#678391
Red spined caterpillar - Polygonia interrogationis

Red spined caterpillar - Polygonia interrogationis
Windsor County, Vermont, USA
July 22, 2012
My son found this crossing the road and wanted to know what it is. I found a lot of close brushfoots, but in the end could not id it.

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Moved from ID Request.

I would go with Polygonia interrogationis.
Question mark looks like a close match:

hmm
I'm not a professional by no means however this does seem to show some resemblance to the baltimore checkerspot caterpillar though coloration is different wish i could help out though there is plenty of folks who could probably better assist you with this on here

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