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Datana angusii
The caterpillar was on the ground hanging onto a walnut tree leaf.
Meadow on our property in the Poconos.
I just found out it is the Walnut Caterpillar myself because I got the wrong tree. It is a walnut tree. Thanks so much Karen and Eric. And Karen, you will be glad to know I have another unidentified caterpillar and it is DEFINITELY the gypsy moth caterpillar. LOL