Leptogenys falcigera is a large (7.0–7.8 mm), dull black ant with large eyes, a projecting triangular clypeus, and long, edentate and falcate mandibles. The combination of the clypeus shape and curved mandibles give the ant a distinctly ‘smiling’ appearance. The native range of L. falcigera is somewhat of a mystery. Although generally considered to be of African origin, the species has not been recorded from the continent. Although common across Madagascar’s coastal habitats and surrounding islands, the species does not penetrate into the interior. Otherwise L. falcigera is only known from Sri Lanka and Pacific islands. Leptogenys falcigera is the type species for the genus, and was first described from Sri Lanka (Roger, 1861). The Hawaiian population was originally described in the late 1879 as a new species under the name L. insularis Smith, F., which was later synonymized with L. falcigera by Wilson & Taylor (1967). The maxillosa group, to which L. falcigera belongs, includes several other species which are also tropical tramps and likely rely on human commerce for transportation (Bolton, 1975). Although the species is associated with disturbed habitats, it is not considered a significant pest (Reimer, 1994).
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