Hodges # 7474
Caterpillar foods: many plants including aster, clover, coneflower, hoptree, juniper, Myrica, oak, cherry, willow (Bugguide) also grape, holly, viburnum, dock, St. John’s Wort, Black-eyed Susan, fleabane, goldenrod, joe-pye weed, sunflower, yarrow (Wagner)
There are many species of Eupithecia that look similar and so are hard to distinguish. This is one of the commonest species, and these IDs are my best guess.
7/27/2009 This is probably E. miserulata. According to Wagner, this is a very common caterpillar especially later in the summer.