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Hornworm caterpillar

Hornworm caterpillar
Ashtabula County, Ohio, USA
September 9, 2010
Size: about 2 inches
Interesting caterpillars keep showing up on this shrub!

Images of this individual: tag all
Hornworm caterpillar Hornworm caterpillar

Host plant
Yes, the host plant is a willow, could be either Pussy Willow or Prairie Willow. There is a small Viceroy (I think, it's very spiney) larva on the same bush.

Moved from Walnut Sphinx.

Thanks Ryan,
I see Sean answered below that this was probably a willow which would most likely rule out A. juglandis.

Here are two links to photos at www.silkmoths.bizland photos.
Paonias excaecatus
Smerinthus jamaicensis

Not a walnut sphinx
This larva doesn't look right for a walnut sphinx, and the hostplant which appears to be some sort of willow also does not match for the walnut sphinx. This is more likely either Smerinthus jamaicensis or Paonis excaecata.

Moved from ID Request.

Welcome to Bug Guide!

i think:
Amorpha juglandis

Correct ID

looks good
and nice photo Sean!
What is it is feeding on?

I think the plant is some kind of willow, will try to ID it. This particular shrub is by itself in a weedy field and seems to attract many caterpillars, including viceroy and recently a nice io moth larva.