Key to species based on the worker caste (except for C. treubi apilis Forel, which was not examined) 1 Clypeus with distinct rugulae. Petiole rectangular, with angular corners in dorsal view (Fig. 3 a). Occipital carina developed as distinct ridge (Fig. 2 a).................................................................................. 2 - Clypeus relatively smooth and shining without distinct rugulae. Petiole broader anteriorly than posteriroly, but without angular corners (Fig. 3 b). Occipital carina undeveloped, without distinct ridge (Fig. 2 b).................................... 3 2 Clypeus with one longitudinal rugula on the median portion and two distinct pairs of longitudinal rugulae laterally. Dorsal promesonotum with dense reticulate sculpture (Fig. 4 a)................................................... brevis - Clypeus with two distinct pairs of longitudinal rugulae, but lacking median rugula. Dorsal promesonotum with more open reticulate sculpture with shiny interspaces (Fig. 4 b).................................................... overbecki 3 Propodeal spines undeveloped (Fig. 12)................................................................ yappi - Propodeal spines developed (Fig. 6)....................................................................... 4 4 Postpetiole strongly bilobed behind (Fig. 3 c)........................................................... walshi - Postpetiole weakly bilobed (Fig. 3 b)....................................................................... 5 5 Metanotal groove distinct and deep (Fig. 5 a).......................................................... bouvardi - Metanotal groove less distinct and deep (Fig. 5 b)............................................................ 6 6 Propodeal spines short and stout, their length shorter than the diameter of propodeal spiracles (Fig. 5 b)............. kojimai - Propodeal spines long and slender, their length longer than the diameter of propodeal spiracles (Fig. 5 c)............. treubi

Published as part of Hosoishi, Shingo & Ogata, Kazuo, 2012, Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae), pp. 18-30 in Zootaxa 3349 on page 20, DOI: 10.11646/zootaxa.3349.1.2, http://zenodo.org/record/212508