Myrmecia nigriceps is a monogynous ant species with colony sizes of up to several hundred workers. They have a medium development rate and the queen measures 19-23 mm in size while the workers measure 16-21 mm. They have a black head and back with an orange body. Their diet includes food insects, fruit, and syrup. They prefer an arena humidity of 30-50% and a nest humidity of 50-70%.