Thanks, Carie. I had it narrowed down to the Nolidae, but there are actually 4 spots and the furthest back has a noticeable white line posterior to it. However, given the variability in organisms of all types, I think three-spotted is close enough. By the way, sweetgum doesn't grow as far north as Maine, but witch hazel does, which is listed in the Petersen guide as a host.
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