(BGR) this is likely the One-spotted Variant - Hodges#6654 (Hypagyrtis unipunctata), however

likely - One-spotted Variant Moth (Hypagyrtis unapunctata)
There are four species of Hypagyrtis in North America. (BG info page)
http://bugguide.net/node/view/11344
and:
http://bugguide.net/node/view/982305/bgimage
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However:

Because of comments by Paul Dennehy at link below, I filed it under the genus "Hypagyrtis" at BugGuide:
http://bugguide.net/node/view/648209/bgimage
and:
http://mothphotographersgroup.msstate.edu/BobBelmont/450/VariantSpecies.shtml
(quote)
Probably shouldn't be separated
Here is what Bob Belmont has to say about these species:

I have a huge series of each of the "species," 6654 - Hypagyrtis unipuncta, One-spotted Variant, and 6655 - Hypagyrtis esther, Esther Moth. The problem with this collection is that it is a "group". I could take 10 photos of one and list them as the other and no one would know the difference. You could take any of them and segregate out what you thought was one group and it will look like a possible separate group, slightly different from the rest -- the variation runs through from one to the other, from males through females. Dr. Doug Ferguson, before he passed away, said that this group needed "more careful examination." He also said that he thought there may be at least one new species within these, possibly the larger solid red-brown to brown individuals. And there may even be more depending upon genitalic differences. He also mentioned that they may just be all one species with high variation. That's why I have one large group under both species. I'll eventually mount and compare genitalia before offering a definite species name on these. When segregated by visual appearance the extreme ends of the resulting spectrum do appear to be mildly different, but I don't feel at all comfortable placing specific names on them at this time.

Reference and photos: http://mothphotographersgroup.msstate.edu/BobBelmont/450/VariantSpecies.shtml

Based on this, I don't think photos of these should be separated into species at this time, seeing as how experts on the group do not even feel comfortable IDing specimens in hand to species. I generally place these on the Hypagyrtis genus page when they show up in ID request, even if they appear to be closer to one "species" than the other.
… Paul Dennehy, 30 May, 2012 - 7:59am
(unquote)