Review of the Crematogaster popohana-group with the description of a new species from the Indochinese Peninsula (Hymenoptera: Formicidae)

The Crematogaster popohana-group is reviewed and two species and one subspecies, including one new species, C. fumikoae sp. nov. are recognized. The C. popohana-group is distinguished from other Asian Crematogaster species by the slender petiole with weakly convex sides. A key to the species based on the worker caste is also provided. Morphological features of the unique slender petiole are discussed.