The genus of Stomaphis (Aphididae: Lachninae) is stem or root feeding aphid on trees and can be easily distinguished in having the very long rostrum which extends beyond the length of body. Most of species are monoecious holocyclic without host alternation and attended by ants. Based on body appearance and COI gene sequence, we report a Stomaphis betulidahuricae Zhang and Qio, 1999 (Aphididae: Lachninae) for the first time in Korea, on Carpinus cordata Bl., C. laxiflora Bl., and Acer palmatum Thunb.

• Hong-Yul Seo(National Institute of Biological Institute)
• Ki-Gyung Kim(National Institute of Biological Institute)
• Sun-I Kim(National Institute of Biological Institute)
• Hwalran Choi(School of Agricultural Biotechnology, Seoul National University)
• Seunghwan Lee(School of Agricultural Biotechnology, Seoul National University)