The genus Hypsopygia was established by Hübner, 1825, with type species Phalaena costalis Fabricius, 1775. Hypsopygia is characterized by the elongated uncus and valva, and pointed saccus in the male genitalia. It consists of 105 described species (Nuss et al., 2003–2024) in the world, and 11 species have been recorded in Korea (Kim & Paek, 2020; Shin et al., 2023). In this study, we reported one newly recorded species in Korea. Illustrations of adults provided, with information of host plants of all examined species.

The genus Olethreutes, established by Hübner in 1822, is based on the type species Phalaena arcuella Clerk, 1759. Olethreutes is one of the largest group within the family Tortricidae, with more than 130 species worldwide. As of now, about 31 species of the genus Olethreutes have been reported in the Korean peninsula. The proposes of this study is to describe one new species, with three similar species form Korea.

A taxonomic study was conducted on Spilonota Stephens, 1834 in Korea. As a result of the research based on materials from Incheon National University two new species; S. samseong Choi, Bae & Nasu, and S. laticucullusa Choi, Bae & Nasu from Korea. This study provides a brief description of the new Spilonota species in Korea, as well as comparisons with similar species and illustrations of adult and genital morphology.

The genera Spilonota Stephens, 1834 and Lepteucosma Diakonoff, 1971 are belonging to the tribe Eucosmini, subfamily Olethreutinae. In Korea, there are five species of Spilonota recorded: S. albicana (Motschulsky, 1866), S. eremitana Moriuti, 1972, S. lechriaspis Meyrick, 1932, S. ocellana ([Denis & Schiffermüller], 1775), and S. semirufana (Christoph, 1882). Only one species of Lepteucosma is recorded: L. huebneriana (Kocak, 1980). Both genera are agricultural pests that infest host plants belonging to the family Rosaceae, specifically causing damage to genus Malus (apple trees) and genus Rubus (blackberry plants), respectively. In this study, we provide a checklist of Korean Spilonota and Lepteucosma, with information of host plants and distribution for each examined species.

The subfamily Epipaschiinae belongs to the family Pyralidae in the superfamily Pyraloidea. Moths of the epipaschiine are mostly medium-sized, and around 705 species have been described worldwide, with most of them distributed in Tropical and Temperate Regions (Nuss et al., 2023). In this study, 24 species of 10 genera of the subfamily Epipaschiinae are identified. All of the species are accompanied by distributions, host plants, and collection site information. Illustrations of adults, male and female genitalia are provided.

The subtribe Olethreutae Diakonoff (1973) which is one of the large subtribe in the subfamily Olethreutinae in the Tortricidae. Diakonoff classified the Olethreutae into a total of 27 genera and three genus groups: Olethreutes, Hedya, and Apotomis. According to the check list of insects from Korea (KSAE & ESK, 2021), 62 species from 11 genera of Olethreutae have been recorded in Korea. This study, provided with redescriptions, distribution, host plants, along with illustrations of adults, male and female genitalia are given.

Two new species, Stericta jaeshini Kim & Bae, sp. nov. and S. atroaurantiaca Kim & Bae, sp. nov. are described from Laos and Cambodia. About 50 species of the genus Stericta have been recorded from Southeast Asia, but it has not been recorded to occur in Laos and Cambodia previously. We record the presence of this genus in these two countries for the first time in this study. Illustrations of adults and genitalia of examined species are provided.

According to Diakonoff (1973) subtribe Olethreutae is classified into a total of 27 genera and three genera groups: Olethreutes, Hedya, Apotomis. Up to data, 62 species belonging to 11 genera of Olethreutae have been reported in Korea(KSAE & ESK, 2021). In this study, we provide a checklist of subtribe Olethreutae with illustrations of adult, and genitalia of example species of each genus group.

Eucosmini Meyrick, 1909 is one of the largest groups in subfamily Olethreutinae, with more than 1,650 species of 128 genera. In Korea, 96 species of 26 genera have been recorded by several authors (Park, 1981, Bae, 1992, et al.). In this study, we provide a brief overview and a checklist of Eucosmini, with illustrations of adults and genitalia for examined species.