Prolasius advenus is a species of ant in the genus Prolasius. It is endemic to New Zealand, widespread across the North and South Islands, including offshore islands.[1] It is a relatively small ant, with workers 2.9-3.5mm in length. Its common name is small brown bush ant.
Colonies can include hundreds of workers and multiple queens. Prolasius advenus is found in a variety of forest habitats. It is a generalist forager, preying upon and scavenging small arthropods, as well as tending mealy-bugs and scale insects for honeydew.