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 com posed of two species, I. discors Forel and I. obscurior Forel (the lat ter previously a subspecies of I. discors). The names I. discors aeneo gaster Wheeler, I. discors occipitalis Forel and I. discors occipitali s exilior Forel (an unavailable infrasubspecific name) are newly synon ymised with I. discors. I. discors is distributed broadly across south ern Australia (excluding Tasmania) and occupies a wide range of habita ts. I. obscurior is known from only two collections, both relatively m oist sites in southeastern Australia.