The genus Trixagus Kugelann is one of the most diverse genera in the family Throscidae Laporte, which comprises about 80 species. Only a single species of this genus has been reported in Korea throughout the entire family. In this study, three additional species, Trixagus sp., Trixagus leseigneuri Muona, and Trixagus turgidus Hisamatsu are reported for the first time in Korea. Similar to that of the species illustrated in Kovalev, males of Trixagus leseigneuri Muona and Trixagus turgidus Hisamatsu possess sexual modification on mesotarsus. Trixagus sp. and Trixagus turgidus Hisamatsu exhibit characters that are unusual for this genus, including the unincised eye, a blade-like structure on the protibia, and others. Illustrations of habitus and diagnostic characters of each species are provided.

The genus Caenoscelis C. G. Thomson (Coleoptera: Cryptophagidae: Cryptophaginae) comprises approximately 30 species in the world, primarily distributed in the Holarctic region. Although 15 Caenoscelis species occur in the Palearctic region, only a single species, Caenoscelis sibirica Reitter, has been documented in Korea. In this study, Caenoscelis koreanus sp. nov. is described, and Caenoscelis ferruginea (C. R. Sahlberg) is reported for the first time in Korea. The new species can be distinguished from other Caenoscelis species by their subquadrate antennomere 10, fully developed hind wings, and male genitalia with subacute parameres and indistinctly separated lateral lobes. Illustrations of habitus, diagnostic characters, and a distribution map of Korean Caenoscelis species are provided.

The family Gelechiidae (Lepidoptera: Gelechioidea) is known as one of the largest families in Microlepidoptera, encompassing about 600 genera and more than 5,000 described species worldwide. However, the genus Altenia Sattler, 1960 has been poorly studied in Korea, with only one known species. Here we introduce a new species, Altenia parascriptella sp. nov., from Korea, providing photos of adults and genitalia for both sexes, along with diagnostic characteristics.

The genus Acronicta Ochsenheimer, 1816 is known as a forest pest. The acronictine species is widely distributed across the Afrotropical, Oriental, Australian, and Neartic regions. This study presents a new record of an acronictine species from Korea, including descriptions, illustrations, and diagnostic characteristics. Additionally, the CO1 barcode data of the newly recorded species is compared with the global barcode reference at the species level. New data on the recently recorded species has been obtained from this study. This information will aid in the prompt identification and preparation for potential pest outbreaks.

The genus Cephennodes Reitter (Coleoptera: Staphylinidae: Scydmaeninae) comprises approximately 220 species worldwide within three subgenera (Cephennodes, Aculeodes, Fusionodes). In Korea, two species are recorded: C. (s. str) japonicus (Sharp) and C. (Fusionodes) graeseriReitter. The two subgenera, Cephennodes and Fusionodes, can be distinguished by the form of the parameres in relation to the median lobe, whether fused or divided. In this study, we redescribed two species: C. (s. str) japonicus and C. (Fusionodes) graeseri. Additionally, Cephennodes (Fusionodes) ussuricus (Kurbatov) is recorded first time in Korea. Images of habitus, aedeagus, and a distribution map are provided.

A total of 187 species are involved in the genus Pidonia Mulsant (Coleoptera: Cerambycidae: Lepturinae) worldwide, of which 174 species are distributed in Eurasia. Since Bates recorded P. (P.) gibbicollis in 1888, a total of 17 species have been recorded in Korea. After An & Kwon’s study on Korean Pidonia in 1991, no taxonomic study has been carried out for almost 30 years, making it difficult to identify the species due to their mutations. In this presentation, we provide an update on the taxonomic study of Korean Pidonia and report a newly recorded species, P. (P.) obscurior hakusana, in Korea.

In the genus Asobara Foester, 1863 (Braconidae: Alysiinae), two new species, Asobara rotundata sp. nov. is described and illustrated. In addition, the DNA barcode region of the mitochondrial cytochrome c oxidase subunit I (COI) were sequenced for the species. An identification key for the Asobara species officially recorded from Korea is provided.

The genus Eudarcia belong to the subfamily Meessiinae was established by Clemens (1860), based on type species Eudarcia simulatricella Clemens, 1860. The genus is comprising 82 species in the world, which are wide spread and diverse throughout the Palaearctic region. Among them, nine species of Eudarcia are distributed in East Asia. In Korea four species of the genus Eudarcia have been reported to date. In the past, the subfamily Meessiinae was treated within the family Tineidae. Regier (2015) revised the addition of two families (Meessiidae, Dryadaulidae) to the superfamily Tineoidea through molecular analysis. In this study we described Eudarcia sp. as a new species, with illustration of adults and male genitalia.

The subfamily Pselaphinae is one of the largest groups in the family Staphylinidae. Pselaphine beetles consists of 6 supertribes. The supertribe Faronitae consists of 30 genera worldwide, with 14 genera in Australia and New Zealand. While examining faronite specimens, we separated 366 specimens that did not belong to any known faronite genera. Species of this genus can be separated from other faronite genera by the foveal system, features of the aedeagus, and collection localities which are only collected in the southern part of Australia. Through this study, we describe seven new species and three new combinations that previously belonged to the genus Sagola.

국내 미기록속인 Ectopsocus를 미기록종인 E. briggsi McLachlen,1899 (외다듬이벌레; 신칭)와 함께 보고한다. E. briggsi은 한반도의 남부지 역인 거제, 진주, 울산, 제주에서 채집되었다. 이번 연구에서 이 종의 정확한 동정을 위해 외형과 진단형질의 사진을 제공한다.