The genus Eriosoma Leach, 1818 belonging to the subfamily Eriosomatinae (Hemiptera: Aphididae) includes 46 species in the world. The genus is mostly distributed in the Holarctic and Oriental regions. Most of the species in the genus form leaf-roll galls on Ulmus species. Until now, there are few studies about the genus on the morphological taxonomy in Korea. Up to date, seven species of the genus have been recorded from Korea. In the present study, a total of nine species of the genus is revised. Among them, two species, Eriosoma alabastrum Pashtshenko, 1988 and Eriosoma ulmi ulmi (Linnaeus, 1758), were discovered for the first time in Korea. We provide a key to the Korean species and full redescriptions in detail.

• Jieun Lee(Department of Plant Medicine, Gyeongsang National University)
• Wonhoon Lee(Department of Plant Medicine, Gyeongsang National University/Institute of Agriculture & Life Science, Gyeongsang National University)