I think Eastern looks good. Of the Appalachians that I've seen, the biggest difference appears to be in the shape of the HW. The scalloping is useful, but the HW of appalachiensis tends to be quite a bit more angular, whereas the Easterns' are more rounded. Of particular note is the anal angle of the appalachiensis HW (specifically the area of the tail to the anal angle), which appears to extend further than in glaucus. This along with a more straight (not literally straight, but more direct path from HW apex to anal angle) outer margin gives the HW the more angular appearance. I'd love to see the ventral HW for a little more certainty, but ...

I guess size would help since appalachiensis is apparently quite larger than the spring brood Easterns. There seem to be some other guidelines for ID, but I don't know how consistent or reliable they are. Hopefully a definitive way to distinguish them by appearance will come about. But that's my thoughts on this one; Given the location, I don't know that we can be 100% certain, but I think you were right Ted in calling it a P. glaucus.

Thanks JD for jumping in and sharing your expertise. When I initially encountered it, I just couldn't ignore the possibility of a rare find. Perhaps only DNA (or Pavulaan and Wright) could get a 100% positive ID. I do agree that the appearance of the tail and surrounding area of HW does not seem to be "squarish" enough for appalachiensis so P. glaucus it is.