The genus Phyllotreta Chevrolat belonging to the subfamily Alticinae (Coleoptera: Chrysomelidae). One of the largest alticine genera with approximately 150 species in the Palearctic region and more than 250 species worldwide. In Korea a total of 6 species were known by Lee and An (2001). New species of Phyllotreta Chevrolat, 1837 are described: P. hamata Park sp. nov. from South Korea. The relationships of the new species with the actual species groups of Phyllotreta are discussed. Also, illustrations of diagnostic characteristics of the new species including male aedeagus and spermatheca are provided with a key to South Korean Phyllotreta species. Up to now 7 species of Phyllotreta have been recorded from the South Korea, including the present species.

• Jinyoung PARK(Department of Applied Biology, Kyungpook National University)
• Jong Eun LEE(Department of Biological Science, Andong National University)
• Jong Kyun PARK(Department of Applied Biology, Kyungpook National University)