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First spotted in January 2016, the identity of these ants has been confirmed as the tramp or invasive Copper bellied ant, Ochetellus glaber. Flippie Herbst has provided these superb photos in the hope that householders, especially in suburban Cape Town, can help evaluate the extent of the invasion, as the ants have never been recorded in Africa before. They might originate from New Zealand, other Pacific islands or even Sumatra.
Ochetellus glaber . Small [1.5 - 1.9 mm] dark ants with dark coppery gasters and paler leg joints; superficially similar in shape and movement to Argentine ants [Linepithema humile] but much smaller and darker; both species intensely antagonistic towards each other and attack on contact. Runs in trails, lives in interconnected supercolonies with multiple queens; colonies spread by 'budding'. From its presumed semi- or tropical origins it seems to prefer warmer temperatures and only appears at my house from mid-morning to mid-afternoon [Linepithema operates around the clock]. Has invaded parts of Northern Australia, Florida, tropical S American coast but not California or Europe. On Mauritius, Reunion, Madagascar. Reacts aggressively too to Technomyrmex difficilis which sometimes appears on the same wall.
Identified originally by MeldeM, who must take the credit for the ID; ID confirmed by international myrmecologists Brian Fisher, Barry Bolton, Vincenzo Gentile

Tiny ants, about 2mm, shiny black with paler legs and antennae. Indigenous to South Africa but like their cousins T albipes are displaying distinctive invasive characteristics. Collected at my home in Lakeside, where we note that this ant has successfully driven Argentine ants [Linepithema humile] out of our home altogether [but not out of our garden]. They are nocturnal and seem to prefer the kitchen and bathroom areas, but have also wrecked one computer printer by nesting in it in our office. They and other invasive members of the same genus have a reputation for nesting in [and often destroying] electric and electronic equipment. However, we have found that they prefer to nest in wood when they can. Dolichoderines, they have an unpleasant smell - like dog faeces