Key to the Pheidole fallax species group

14 Major pronotum rugoreticulate......................................................................... 14a

- Major: pronotum transversely carinulate.................................................................. 15

14a Major: Petiole and postpetiole foveolate and faintly carinulate............................. Pheidole gulo Wilson 2003

- Major: Petiole and postpetiole foveolate without carinula.................................. Pheidole rojasae sp. nov.