The Japanese species of the genus Lobesia are revised. The monophyly of the genus is supported by the possession of four autapomorphies. Eight species occurring in Japan are classified in two subgenera : seven species belonging to Lobesia and one to Neolobesia nov. Three new species, Lobesia (Lobesia) arguta, L. (L.) virulenta, L. (L.) yasudai, are described. Lobesia (L.) bicinctana (DUPONCHEL) is newly recorded from Japan. Adults, wing venation, and genitalia of both sexes are illustrated. Host plants are listed. Keys are provided for all the known subgenera and the Japanese species.
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