On the other hand, this spotting here is a poplar.
http://www.projectnoah.org/spottings/12682462
Oh dear, I'm not really helping, am I? If you still have the caterpillar, you could always try rearing it.
It might help if you know what kind of trees are in the area. Viceroys feed on willow, Red-spotted Purple feeds on cherry and oak. Both feed on poplar.
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