Castianeira longipalpa (Hentz, 1847), female.
Definitely not Castianeira spp. Looks more like Gnaphosa sericata or Drassyllus insularis.
You may want to reconsider that statement. (Also fyi the gentleman you’re calling out is a world-class arachnologist). Compare: https://bugguide.net/node/view/712646/bgimage
I stand corrected. There are just so many polymorphisms in this species that appear to be regional. None of my identification manuals (Spiders of N. America, Common Spiders of North America) show this variation.
It just looks different because the scales are worn off.