crazy ants

Scott Solomon, who researches fungus-growing ants, has a brief piece in Slate Magazine on the Paratrechina Crazy Ants invading Houston. I'm not convinced that this ant is anything different from Paratrechina fulva, a common South American species and the oldest name in that species complex. People have been calling the Houston invader "P. cf. pubens", but the taxonomy of the genus is so poor that it's difficult to say anything with confidence. Do you folks who've looked at specimens (that's you, James) have any thoughts about the identity of this ant?