What's That Bug? does not endorse extermination

what is this?
Location: Sacramento, CA
November 9, 2010 12:01 am
Hello there,
Three of these caterpillar/larva are on my deck. I have never seen anything like them before. I took the picture. Also, what is that reddish orange part that isn’t the head? Hope you can help.
Signature: MaryLynn

Red Humped Caterpillar

Dear MaryLynn,
Knowing where to begin a search is often very helpful.  We thought your caterpillar resembled a Prominent Moth Caterpillar in the family Notodontidae, and we were quickly rewarded while searching BugGuide with the Red Humped Caterpillar,
Schizura concinna, a species found coast to coast in North America.  The “reddish orange part that is not the head” is the hump, though we cannot say for certain what its purpose is.

Wow! You guys are sure prompt. Many thanks, Daniel.
ML

What's That Bug? does not endorse extermination
Location: California

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