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Photo#799840
caterpillars on underside of a poplar leaf

caterpillars on underside of a poplar leaf
Wendell, Frankiln County, Massachusetts, USA
July 6, 2013
Maybe these are early instars of Mourning Cloak?

Moved
Moved from Butterflies and Moths.
Thanks David. I should have collected them and would have been able to see what they turned out to be in a couple weeks. The Nymphalis l-album lists poplar as a larval food, but I didn't see any reference for Polygonia interrogationis feeding on poplar.

There seem to be horns on the heads,
but I can't quite tell for certain. I'm thinking maybe Polygonia interrogationis, or perhaps Nymphalis l-album. I don't think any other Polygonia are this color when they are tiny (???). Mourning Cloak caterpillars don't have head horns (rather short bristly things), and they are dark grayish/blackish with red markings even when quite small; and, when newly hatched they may about be this color (with dark heads), but don't have the spines so well developed (these look older than newly hatched to me).

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