- Light brown to black with paler legs and antennae.
- Two node segments.
- Uneven thorax has pair of small spines on upper back.
- 12-segmented antennae, three-segmented club.
- Head and thorax grooved or sculpted with characteristic parallel lines on workers and swarmers (visible with hand lens).
- Stinger present but rarely used.
- Monomorphic workers, 3.5 mm long.