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Sphinx libocedrus
Green caterpillar with white diagonal markings, tail "horn", actively moving and eating
Wooded area in south Dallas
Okay after much hunting I think it's an earlier instar of cedar incense sphinx, Sphinx libocedrus
http://www.silkmoths.bizland.com/sliboce...
This is a sphinx moth and in still looking for an ID. Closest so far would be early instar of hermit sphinx (instars are stages, the molt between each one until maturity, then they form their chrysalis)