Chelaner antarcticus

Chelaner antarcticus, also known as the southern ant, is a species of ant endemic to New Zealand. It was first described in 1858 by British entomologist Frederick Smith and has undergone numerous taxonomic revisions. The ant is highly variable in size and colour, which has led scientists to suspect that it is in fact several species. It is widespread throughout New Zealand, even being found in the Kermadec Islands, and has also been observed in the Austral Islands. Colonies can be formed in a wide range of habitats such as native forest, grasslands and horticultural zones. The nest is constructed either under stones or under logs. It has a generalist diet that includes small arthropods, seeds and it also farms mealybugs for their secretions. C. antarcticus rarely co-occurs with several other species of ant, such as Prolasius advenus and the invasive argentine ant, with the reasons for this being a topic of research. The larva is known to be preyed upon by the larva of Helosciomyza subalpina, a species of fly.

from Wikipedia