Synemosyna formica usually is much darker in color. There are at least three possibilities: (1) this is a teneral specimen, (2) this is a previously unknown color phase that mimics an ant species not found elsewhere in its range, (3) this is another species with a more southern range. Is the specimen available for examination?

I photographed it while working in Kerrville and released it at the nature center - it was a VERY active spider. I've seen & photographed S. formica in FL and agree that this individual is quite different looking. It resembled Pseudomyrmex pallidus (a rather common ant in central TX) so much that I first thought that was what it was. It reminds me of the similiarity between the FL species Synemosyna petrunkevitchi & Pseudomyrmex simplex. I pretty much gave up trying to ID this to species, since it didn't match anything I could find. Maybe P. pallidus has its own special mimic.