In article _C28b.28199$rb3.1258472
@twister.southeast.rr.com,
says...
Oh, left out, that there are two thin YELLOW stripes down the back.
When you squish them, a great deal of yellow gunk squirts out of their
body. Yes, may be tent worms. I can't see a nest.

You might look up whitemarked tussock caterpillar and
see if that is it.
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http://home.comcast.net/~larflu/owl1.jpg

Lar. (to e-mail, get rid of the BUGS!!