Can't ID this caterpillar

[Westre]

        I've notice the droppings from this caterpillar for a couple of
years now but have never been able to find one.  This year they are very
abundant and I've found them on my walkway.  I live on the Eastern Shore of
MD.  They are on oak and beech trees here but someone else said he has them
on apple trees and I've seen them where there were none of these particular
trees nearby.  It's about 1" long and has fine black and white stripes
running the length of its body.  The underside is kind of orange.  The head
and rear are black with white spots.  It's not fuzzy at all.  They appear in
the late summer and I had three on my walkway yesterday.  I have several
people trying to ID it but none have been successful.  I have a picture I
could forward to anyone who would like a look at it.  I don't seem to be
able to attach a picture.

Steve Westre
Denton, MD
swes at dmv.com