Ecologica Montenegrina, 50, 2022, 33-37 http://zoobank.org/urn:lsid:zoobank.org:pub:ABC47E36-B892-42C0-91DF-7CD7FABFAF42 A new species of the genus Caenorhinus Thomson, 1859 (Coleoptera, Rhynchitidae) from North Vietnam ANDREI A. LEGALOV 1,2,3 * 1 Institute of Systematics and Ecology of Animals, SB RAS, Frunze street 11, Novosibirsk, 630091, Russia 2 Altai State University, Lenina 61, Barnaul, 656049, Russia 3 Tomsk State University, Lenina Prospekt 36, 634050 Tomsk, Russia https://orcid.org/0000-0001-7347-8169 * Corresponding author. E-mail: fossilweevils@gmail.com Received 5 January 2022 │ Accepted by V. Pešić: 14 January 2022 │ Published online 15 January 2022. Abstract A new species, Caenorhinus (Flavodeporaus) nahangensis Legalov, sp. nov. from North Vietnam is described and illustrated. This new species is similar to Caenorhinus (Flavodeporaus) lobanovi Legalov, 2021 Laos but differs from it in the different body coloration, narrower rostrum, very weakly curved mesotibiae, densely punctate elytral interstriae, obtuse apex of the aedeagus, and the form of the basal sclerite. From C. nigrobasalis Legalov, 2003, it is distinguish in the narrower rostrum, finely punctate forehead, greenish elytra, red ventrites 4 and 5, pygidium and propygidium, obtuse apex of the aedeagus, and the form of the basal sclerite. Key words: Biodiversity, Curculionoidea, Rhynchitinae, Deporaini, Tuyên Quang Province. Introduction The tribe Deporani usually develop in the leaf mines or the leaf packets (Legalov 2004). The biology of most tropical species remains unexplored. Most species are known from single specimens. The tribe's diversity centre is located in the Oriental Region, but only the fauna of this tribe from Sunda Islands (Indonesia) is fairly well studied (Legalov 2007). The tribe Deporaini of the Vietnamese fauna is found still not complete. Thirty species from 11 genera were known from this country (Voss 1924, 1938; Legalov 2003, 2007). In this paper, the new species of the Caenorhinus Thomson, 1859 from North Vietnam is described. This work continues the study of the tribe Deporaini by Legalov (2003, 2007, 2019a, 2019b, 2021a, 2021b). Material and methods The type specimens are kept in the = Zoological Instutute, Russian Academy of Science, Sankt-Petersburg (Russia) – ZIN and Institute of Systematics and Ecology of Animals, SB RAS, Novosibirsk, (Russia) – ISEA. Ecologica Montenegrina 50: 33-37 (2022) This journal is available online at: www.biotaxa.org/em https://dx.doi.org/10.37828/em.2022.50.5