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To the best of my knowledge Thaumetopoea processionea has also not been reported in North America:http://www.cabi.org/isc/datasheet/53502
Thanks LL. @haley the category should be 'Arthropods'
Definitely Eastern Tent Caterpillars. The yellow like is quite distinctive.
Not with yellow dorsal line?
Oak processionary, I guess
Spotted on May 1, 2015 Submitted on May 4, 2015