Key to species of Taiwanomyrme

1. Males............................................................................................... 2

- Females............................................................................................ 5

2. Mesosoma and metasoma black. Penial valve apically distinctly swollen (Figs 4 C, D)............... T. friekae (Zavattari)

- Mesosoma or metasomal segments 1–3 ferruginous-red. Penial valve apically hook-like (Figs 3, 4 A, B)................. 3

3. Mesosoma black. Metasomal segments 1–3 ferruginous-red..................................... T. basirufus (Chen)

- Mesosoma largely ferruginous-red. Metasoma black......................................................... 4

4. Outer carina on scape beneath less developed than mesal one, distance between carinae 0.3 × scape width (Fig. 2C). Clypeal preapical concave area long (Fig. 2A). Apex of volsellar cuspis with long dense setae (Figs 3 A, B). T. impressoides sp. nov.

- Scape beneath with two well developed carinae, distance between carinae more than 0.5 × scape width (Fig. 2 D). Clypeal preapical concave area shorter (Fig. 2B). Apex of volsellar cuspis with short sparse setae (Figs 3 C, D). T. impressus (Chen)

5. Pronotum laterally (dorsal view) with two blunt tubercles (Fig. 6 B). Scutellar scale very small, pointed. Pygidial area smooth..................................................................................... T. basirufus (Chen)

- Pronotum laterally (dorsal view) with two sharp tubercles (Fig. 5 B). Scutellar scale wide, V-shaped. Pygidial area microstriate................................................................................. T. latisquamula sp. nov.