Understanding the biology of invasive organisms requires knowledge of the native and new ranges of transferred species (Reichard & Hamilton, 1997). Although much is known of the biology of ants (see Holldobler & Wilson, 1990), we know relatively little about the biogeography and behaviour of transferred ants. I use 'transferred' to indicate ants collected in habitats not native to the species; 'invasive' ants are those which establish long-term populations and 'expand their range upon introduction into new areas.