Some kind of swallowtail?
This caterpillar looks a lot like the tiger swallowtail one, shown on your site on 7-07-2004, except that it’s brown instead of green. Can these guys change colors depending on their background? This one was found today on a dark blue shirt after he/she rode into the house out in the country in northern Indiana. He/She is only about 2″ long and in addition to the great false eyes, he/she had lots of beautiful purple (yes, purple!) dots.
Diane M. Whisnant
Many caterpillars, including the Tiger Swallowtail you have sent in, the Spicebush Swallowtail, and some of the Sphinx Moths, change color before metamorphosis.