Brachymyrmex depilis, also known as the rover ant, are small, subterranean ants which live across North America. They require 50-70% humidity and do best in 22-24 degrees Celsius. Their queens range from 4-5 mm and the workers range from 1-2.5 mm. They are fairly difficult to start up but grow at high speeds once they start going. This species is particularly vulnerable to drowning, and so do better if started in foundinf formicaria.
Image credit: Emmett Sussman