A taxonomic study of the genus Maladera Mulsant of Korean Sericinae (Coleoptera, Melolonthidae) is presented. As a result, sixteen species are recognized including one new species, Maladera coreana sp. nov., and one subspecies, Maladera castanea koreana subsp. nov. A key, descriptions of the new species and subspecies, and photographs of aedeagus are provided.

A taxonomic review of the genera Serica Mac Leay and Nipponoserica Nomura belonging to the subfamily Sericinae in Korea is presented. As a result, four species of the genus Serica induding two new species, S. hirsuta sp. nov. and S. lutea sp. nov., and two species of the genus Nipponoserica including one new species, N. opacicarina sp. nov. are considered to distribute in the Korean peninsula. The keys to the species, descriptions of the three new species and illustrations of adult's morphological characteristics and aedeagi are provided.