The Myrmecia nigriscapa is a type of ant species that can have monogynous or occasionally polygynous colonies. The colonies can have several hundred workers and have a medium development rate. The ants range in size from 17-25 mm for workers and 23-26 mm for queens. They are dark red in color with a black belly and have strong, sickle-shaped jaws. They primarily feed on food insects like cockroaches and crickets, as well as fruit and syrup. The ideal humidity for their habitat is not specified.