Crematogaster treubi group

Workers monomorphic. The occipital carina undeveloped, not forming a distinct ridge (Fig. 2 b). Pronotal shoulders not developed as distinct ridges. The petiole in dorsal view broader anteriorly than posteriorly, with rounded, not angular, anterolateral margins (Fig. 3 b). The postpetiole weakly bilobed, but without distinct longitudinal median sulcus. Mesosoma with abundant standing hairs.

This species group is easily defined by the undeveloped occipital carina and generally 2-segmented antennal club, not only from C. brevis group, but also from other Asian Crematogaster species.