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John Lattke has revised the species of tropical Asia and Australia -- antbase.org/ants/publicat.../20288.pdf -- and is working on those of the Americas.

He reports that most are generalist predators, but that some in the New World are specialist predators on millipedes. I encountered a few nests of these latter (in Costa Rica and Brazil), and there were abundant, bleached remains of the exoskeletons of their prey in evidence. It will be interesting to learn more about the feeding habits of the rest of the genus, as their thick cuticles and the above-mentioned sculpturing may be related dealing with large, chemically defended prey (like millipedes, etc.).