This seems to me to be a tough ID challenge to separate tetragona from some white male quadriplaga and no one is putting words around their IDs. Frustrating.

T. tetragona appears to be out of range. Jim Vargo just sent me a correction on his tetragona image at MPG which is actually male quadriplaga, and replaced it with a good tetragona. This matches his male quadriplaga image. You can now see the corrected pages for both at MPG. I removed all the live images of tetragona as well and moved some to quadriplaga per Jim's email. Previously, we had only female quadriplaga and incorrectly identified male tetragona. Poole gives more details here.

According to Jim, west TX and west would be quadriplaga, east of TX would be tetragona and in the rest of TX, males would likely need to be dissected. I believe that females can be separate by visual differences. The inner spot on the costa is fairly isolated in female tetragona for one.

Male T. aprica is in the range of both species. It is larger than tetragona but otherwise very similar to both. I noticed that white st. line ends at the posterior margin basad the anal angle while it dies at the anal angle in the other two. Size would help. Forewing of aprica is about 10mm and 7-8mm for tetragona per Poole. My impression is that quadriplaga may be intermediate.

and I'm not sure the sheet was mine - so no thread count

No problem. I think Jan has it right. Range and maculation would seem to point to quadriplaga as most likely.