Two new ant species of the genus Leptogenys (Hymenoptera, Formicidae) from Hainan, China, with a key to the known Chinese species

Two new species of ponerine ants from Hainan Province, China, Leptogenys hainanensis sp. nov. and L. zhoui sp. nov. , are delineated and depicted based on the worker caste. Leptogenys hainanensis sp. nov. belongs to the L. leleji species group, with mandibles elongate, slender and curved, lacking a distinct masticatory margin. On the other hand, L. zhoui sp. nov. belongs to the L. crassicornis species group, distinguished by its square head, smooth body, mandibles with a dentate masticatory margin, and short antennae. A key to workers for the known species of Leptogenys in China are provided and a map is provided for the newly described species.