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Green caterpillar yellow spots - Amphipyra pyramidoides

Green caterpillar yellow spots - Amphipyra pyramidoides
St Louis County, Missouri, USA
May 16, 2015
Size: 1 1/2- 2 inches
It was on a Sassafras tree. A surprisingly fast mover.


Moved from ID Request.

Copper Underwing?

copper underwing?
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