The aphid genus Micromyzodium David, 1958 is newly recognized in the Korean Peninsula. This genus is characterized by very long dorsal abdominal hairs, almost 3 to 4 times as long as the basal diameter of antennal segment III. Colonies of two Micromyzodium species, Micromyzodium kuwakusae Uye, 1924 and Micromyzodium nipponicum Moritsu, 1949, were collected on Fatoua villosa Nakai (Urticales: Moraceae) and Perilla frutescens Britton (Lamiales: Lamiaceae), respectively. In this study, important characteristics are redescribed, illustrated, and measured for the apterous viviparous females of these species.