Unusual caterpillar ... please help!

[Sunsol Daniels]

Cindy Medd <cmedd at techplus.com> wrote:
>
>I hope someone can help me identify a very unique looking caterpillar
>that I pulled off my apple tree today.  It resembles the tobaco 
hornworm
>in color and size ... green with white markings and about four inches 
in
>lenght and about as thick as a males index finger ... but differs in
>that it has spine like protrusions along the sides and back of it's
>body.  These spines are quite colorful ... the ones along the side of
>the body are blue, the first set of four on it's head are orange with
>tiny black dots, and the remaining along it's topside are yellow. 

Maybe Hyalophora cecropia or Callosamia promethea
s