Key to Pseudonotoncus species based on workers

1. Petiole approximately square in dorsal view (Figs 1 D, 3); in lateral view almost as long as high, the anterior face rounding gradually into the domed dorsal face (Fig. 1 B). Dorsal surface of petiole with course longitudinal rugae (Fig. 1 D).. eurysikos

-. Petiole broader than long in dorsal view (Figs 2 D, 3); in lateral view much higher than long, the anterior face separated from the flat dorsal face by a rounded angle (Fig. 2 B). Dorsal surface of petiole smooth or with small foveate depressions (Fig. 2 D).............................................................................................. hirsutus