This ant is called “obscure-thorax” because its thorax is dark, while its head is colored red. This species is an introduced ant species, originally from Argentina and Paraguay. It has been found in Alabama and northwestern Florida here in the US. It usually lives in disturbed areas, but it has also been found in forests. For a long time, this ant was considered to be a distinctive variety of another species, Pheidole fallax, but upon close inspection these two proved to be distinctive species. Look closely at the ants in your neighborhood – there are still lots of new species out there, many are just waiting to be noticed!