Key to species of Chinommatia n. gen.

1. Carapace, chelipeds, ambulatory legs covered with dense, stiff setae that obscure margins [Vanuatu]........ C. turpis n. sp.

- Carapace, chelipeds, ambulatory legs can be covered with low pubescence or scattered setae that never obscure margins or surface................................................................................................2

2. Anteroexternal angle of merus of third maxilliped with broad, auriculiform structure (e.g., Fig. 32 A).................. 3

- Anteroexternal angle of merus of third maxilliped not auriculiform (e.g., Fig. 32 E)................................. 4

3. Inner surface of minor male chela, at base of pollex, with large, swollen tooth (Fig. 44 A, B). Ventral margin of ambulatory merus with small spines even in large individuals (Fig. 44 F). Distal half of G1 distinctly curved (Fig. 75 A) [ South China Sea; Philippines]............................................................................... C. cavimanus

- Inner surface of minor male chela, at base of pollex, with distinct bilobed tooth (Fig. 44 C, D). Ventral margin of ambulatory merus with prominent spines in large individuals (Fig. 44 H). Distal half of G1 relatively straight (Fig. 75 J) [Papua New Guinea; Fiji].......................................................................... C. bicuspida n. sp.

4. Carapace relatively quadrate (Fig. 14 G–J). G1 relatively stout, tip can be flared (Fig. 75 E, G). Long, slender ambulatory legs (Fig. 14 G–J) [? Philippines; Malaysia (Sarawak); Indonesia]............................................ C. bruuni

- Carapace ovate with anterolateral margins arcuate (Fig. 15 A). G1 not known. Relatively short, stout ambulatory legs (Fig. 15 A; Tesch 1918: pl. 9, fig. 3) [Indonesia]........................................................ C. littoralis