Your images are great. Lynette has moved this to the lenta group, which seems like a good solution for now. Until we know better (or someone comes along who knows better) , I'm willing to believe that this might be Hogna lenta.

Are you keeping it in captivitiy?

-Kevin

and I'm not keeping her in captivity. It seems we have more than our share of them here, so finding them isn't any problem. I just look in the pool every morning. :-)
There were two this morning, one of which looked almost like a twin to this one, just a little darker in color and just a little smaller. I did get a more accurate measurement of 25mm BL, which means the method I used to determine the size of that other Hogna wasn't all that accurate and I should have trusted my eyes more.
(The size for this one is fairly accurate as I based it on her body being just a bit shorter than 3/4in plywood is in thickness.)

H. frondicola has the two dark spots on the abdomen, but the lateral bands on the carapace seem to be quite different. H. carolinensis has the black venter, but here it stops at the epigastric furrow.

Beautiful spider!

-K

So the two I know of that have that description are H. baltimoriana & lenta. Between those two it matches lenta better because it says the epigastrium is black. Also baltimoriana does not have black coxae. However, there are probably others that I don't have descriptions for :(.

Edit: I looked up the Hogna lenta group and added that info to the guide page.

Well, perhaps lenta... which appears to have a "hastate mark" (heartmark with two basal lobes). If I look closely, I think I can imagine that I see that here, and likewise, looking at other apparent lenta specimens, they appear to have a heart mark flanked by two darker spots.

The lenta group (looks like you found this) comes, I think, from Wallace's 1942 article. In it he writes that the male lenta has "sternum, labium and venter black; coxae dusky". In the description of the female he then adds "hastate mark on dorsum indistinct".

But without being able to look at a number of sure specimens (genitalia matched), I find it difficult to feel too certain about my own opinions, here. That said, H. lenta seems like a good call.

(Where are our Floridians when we need them?) :-)

[BTW, subadult?]

-K