black body, white hair with a little brown at the roots. fairly thick. about an inch long. found in bangor, maine.
Your caterpillar turns into the Hickory tussock moth. There are two lashes of long black hairs on the front and back end of this caterpillar. They are found in woodlands from SE US to the northeastern North America up into Nova Scotia.
The adults fly at night and do come to lights. The caterpillars prefer to feed on foliage of hickory and walnut, but will eat oak, ash, elm and other trees. There is one generation per year.
Some people are allergic to the hairs, so handle carefully.