Ulziijargal Bayarsaikhan

A new species, Miltochrista marginipicta sp. nov., is described from Laos. Illustrations of the adult and genitalia are provided. The new species is compared with Miltochrista ziczac (Walker) and M. wangmini Volynkin, Dubatolov & Kishida, M. perihaemia (Hampson), M. obscuripostica Dubatolov, Kishida & Wang, and M. tenera Bucsek.

Previously, thirty-one species of the subfamily Crambinae (Lepidoptera: Crambidae) have been recorded in Mongolia. Based on our newly collected materials from northeastern Mongolia, two species are reported for the first time from the country: Neopediasia mixtalis (Walker, 1863) and Pseudocatharylla inclaralis (Walker, 1863). We provide an updated checklist comprising 33 species belonging to 11 genera. In addition, we present COI barcode data for six species collected in the north and east of Mongolia. The distribution patterns of 18 species of Crambinae whose occurrence in Mongolia has been fully documented were examined in accordance with vegetation zones, and a clear separation between north–south occurrences of species was observed. Additionally, the species distributions were examined in relation to major river basins, where their occurrences broadly separated by the boundary between the Central Asian Endorheic Basin, the Arctic Basin, and the Pacific Basin.

A new Toerpenola László, Ronkay & Witt, 2010 species, T. laosiana Cha sp. nov. is described with illustrations of both sexes. A checklist of the genus and some taxonomic discussions are also presented.

This paper contains three newly recorded genera (Wittonola László, Ronkay & Ronkay, 2015; Aeneanola László, Ronkay & Ronkay, 2013; and Evonima Walker, 1865) and each new species (W. bicyanasp. nov., A. crassasp. nov., and E. palawanensissp. nov.) from Palawan, the Philippines. We provide illustrations of three new species and their genitalia, photographs of collecting sites, and checklists of the three genera.

Two new species, Halone angkorwat sp. nov. and H. specularis sp. nov. are described from Cambodia, with one newly recorded species, H. ivetae Bucsek, 2020. A diagnostic comparison of new species is made with H. ariadna Bucsek, 2012 and H. arcuata Bayarsaikhan & Bae, 2022. Illustrations of adults and genitalia of all examined species are provided.

The genus Limbobotys is recorded from Laos for the first time, including three newly recorded species (L. ptyophora, L. acanthi, and L. limbolalis), one newly combined species (L. acutangulalis comb. nov.), and one new species (Limbobotys digitatus sp. nov.), described herein. This study provides photographs of adults and genitalia for all examined species, along with an identification key for the Limbobotys species occurring in Laos.

A new species, Miltochrista aurantia Bayarsaikhan & Bae, sp. nov. is described from Laos, and seven species, M. terminata (Moore, 1878), M. calamaria (Moore, 1888), M. quadrata (Holloway, 2001), M. kontumica (Dubatolov & Bucsek, 2013), M. simonka (Bucsek, 2014), M. lavides Volynkin, Černý & N. Singh, 2020, and M. tenuiprocessa Volynkin, Černy, Huang & Saldaitis, 2023, are newly recorded in this country. The previously unknown female genitalia of M. acteola (Swinhoe, 1903) and M. parvulus Bucsek, 2020, are studied for the first time. Illustrations of adults and genitalia of the examined species are provided with a list of known species of the genus from Laos.

A new species of Olethreutes Hübner, 1822, O. palbongensis Kim & Bae, sp. nov. from Korea is described as new to science. We provide diagnostic features of four allied species, O. arcuella (Clerck, 1759), O. captiosana (Falkovitsh, 1960), O. oculata Kim, Byun & Bae, 2022, and O. subtilana (Falkovitsh, 1959), along with a redescription of the female genitalia of O. captiosana. Additionally, illustrations of adults and genitalia are provided for all known species.

In this study, 11 species of the genus Diduga Moore, [1887] are recognized from Thailand, including a new species, Diduga siamensis Bayarsaikhan & Heppner sp. nov., and one newly recorded species, D. scalprata Bayarsaikhan, Li & Bae, 2020. Illustrations of adults and genitalia of the additionally examined species are provided, with a checklist of known species of the genus from this country.