Paratrachymyrmex

1. Median pronotal spines separated (Fig. 2, B), not basally fused (Fig. 2, A).

2. Mandible dorsally striated (Fig. 2, E), sometimes solely basally striated [e.g. P. levis (Weber, 1938)]. 3. Preocular carinae short, sometimes curved towards the frontal carinae (Fig. 2, B, E) [e.g. Paratrachymyrmex diversus (Mann, 1916), P. intermedius (Forel, 1909), and P. mandibularis (Weber, 1938)].

4. Pilosity sparse (Fig. 2, G).

5. Postocular protuberance inconspicuous (Fig. 2, E).

6. Vertexal corners generally rounded (Fig. 2, E).

7. Posterior margin of head usually with strong median impression (Fig. 2, E).

8. Postpetiole in lateral view often with posteromedial impression (posterior margin concave) (Fig. 2, G, J). 9. First gastral tergite often with conspicuous pair of lateral ridges, median pair usually poorly-marked or absent (Fig. 2, J).

10. Propodeal projections short in most species [except in P. diversus, P. intermedius, and P. mandibularis]. 11. Promesonotum usually with subequal-sized projections (Fig. 2, G) [except in P. intermedius and P. mandibularis]. 12. Antennal scape never with basal lobe; microtubercles tiny (Fig. 2, B, E).