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According to descriptions in Wikipedia, this is the fourth instar. In the first three they are brown. Then they turn this bright green with one yellow and black stripe and two fake eyes. It also has yellow-orange antennae that come out sometimes.
Tulip trees, wild black cherry and magnolia, as well as birches, willows and aspens.
We found him on the ground. Since wild cherry are the most plentiful of its host plants we figure he fell off a cherry tree. He's on a cherry branch in the photos.