Fourteen species of the genus Aulacorthum Mordvilko 1914 (Sternorrhyncha: Aphididae) are recognized from the Korean Peninsula. One new species, Aulacorthum artemisiphaga sp. nov. on Artemisia princeps and Artemisia stolonifera (Asteraceae) was compared with the seven congeneric species based on their morphological and molecular characteristics. Morphometric analysis using 29 morphological characters shows that A.artemisiphaga sp. nov. can be distinguished from the seven congeneric species. In comparisons of COI and CytB genes, A. artemisiphaga sp. nov. had inter-specific genetic distances (average 7.5% for COI and average 7.4% for CytB) similar to those of other congeneric species. Host plants of the Korean Aulacorthum are reviewed.

• Wonhoon Lee(Insect Biosystematics Laboratory, Research Institute for Agricultural and Life Sciences, Department of Agricultural Bio-technology, Seoul National University)
• Seunghwan Lee(Insect Biosystematics Laboratory, Research Institute for Agricultural and Life Sciences, Department of Agricultural Bio-technology, Seoul National University)