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.

… Sean Artman, 10 September, 2010 - 4:12pm

Moved

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

… Maury J. Heiman, 10 September, 2010 - 2:47pm

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.

… Ryan St Laurent, 10 September, 2010 - 2:22pm

Moved

Moved from ID Request.

Welcome to Bug Guide!

… Maury J. Heiman, 10 September, 2010 - 10:10am

i think:

Amorpha juglandis

… Edna Woodward, 10 September, 2010 - 8:46am

Correct ID

http://bugguide.net/node/view/453222/bgimage

… papilio28570, 16 July, 2013 - 9:24am

looks good

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

… Maury J. Heiman, 10 September, 2010 - 10:08am

Thanks

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.

… Sean Artman, 10 September, 2010 - 10:25am