The specimen IS quite handsome. The H. bistriolata is not reported in the guide, either, but the Moth Photographer's Group representative does appear to have similar markings as this one. I noticed that the species H. bistriolata has been reported as far east as West Virginia.

I'm actually not surprised it isn't reported in the guide. It's not very common in Virginia (or east of the Appalachians for that matter) and is in fact considered rather "rare" and listed on the VA Dept of Conservation's watch list (ref. here and here). So to have such a handsome specimen from VA is quite a treat.

When researching this species, I noticed that the Moth Photographers Group has only one photo to represent the H. bistriolata. How would I give permission for the use of this photograph, and any others that I might display here that are useful for identification, on the Moth Photographers Group site?

The easiest thing to do would be to drop Bob (Patterson) a quick note. I'm sure he'll be more than happy to display it on MPG.

This is, indeed, a very special find. I have printed off the rare species sighting form and will submit the details of the sighting to the VA Department of Conservation. I am delighted to be able to report its presence in Staunton. ... then, of course, I will add the species to shenandoahvalleymoths.net

Thanks for your help in the identification!