Revision of the Iridomyrmex discors species-group (Hymenoptera: Formicidae)

The discors species-group of the ant genus Iridomyrmex Mayr is defined for the first time and revised at the species level. The group is composed of two species, I. discors Forel and I. obscurior Forel (the latter previously a subspecies of I. discors). The names I. discors aeneogaster Wheeler, I. discors occipitalis Forel and I. discors occipitalis exilior Forel (an unavailable infrasubspecific name) are newly synonymised with I. discors. I. discors is distributed broadly across southern Australia (excluding Tasmania) and occupies a wide range of habitats. I. obscurior is known from only two collections, both relatively moist sites in southeastern Australia.