The members of the genus Chaitophous(Hemiptera: Aphididae) has limited host specificity on two genera of the family Salicaceae, Salix and Populus. In this study, as a result, we discovered 5 species new to Korea: C. Horii Takahashi 1939, C. leucomelas Koch 1854, C. salijaponicus Essig & Kuwana 1918, C. tremulae Koch 1854, and C. populialbae yomefuri Shinji 1941.

• Yeyeun Kim(Lab. of Insect Biosystematics, Division of Entomology, School of Agricultural Biotechnology, Seoul National University)
• Hyojoong Kim(Lab. of Insect Biosystematics, Division of Entomology, School of Agricultural Biotechnology, Seoul National University)
• Seunghwan Lee(Lab. of Insect Biosystematics, Division of Entomology, School of Agricultural Biotechnology, Seoul National University)