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I recently camped at Harriman State Park in Southern New York, in early October. Upon returning home, I noticed that I had a passenger with me.

The caterpillar in question is an almost translucent, pale green color with a single reddish stripe running down the center of the back. It is approximately 1.5 inches long, with a reddish face as well.

I tried using a caterpillar identification book, but the closest one I could find also had a split tail, which this one does not.

Side view of caterpillar

Front view of caterpillar

Caterpillar on a ruler (approximately 1.5 inches long)

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Based on this picture, I'd say it's a Macrurocampa marthesia. I realize your specimen lacks the split tail, but I note that the "tails" of the larva of this species are longer in earlier instars. I wonder if this one is just an older caterpillar, getting ready to pupate? The image is a very good match otherwise, and this species does occur in the appropriate range.

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  • $\begingroup$ That sounds fairly reasonable. Doing a search for it gives me a picture that looks even more similar to mine. The diamond shapes on the mid-back seem quite distinctive. I wouldn't be surprised if it was an older caterpillar, it did seem quite pudgy. $\endgroup$ – fyrepenguin Oct 23 '17 at 20:57

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