An integrated taxonomic revision of Ctonoxylon (Coleoptera, Curculionidae, Scolytinae) reveals new Malagasy species originating from multiple recent colonisations of the island Author Jordal, Bjarte H. 0000-0001-6082-443X Department of Natural History, University Museum of Bergen, University of Bergen, P. O. 7800, NO- 5020 Bergen, Norway text ZooKeys 2024 2024-05-28 1203 95 130 journal article 10.3897/zookeys.1203.123757 6FE93D4B-8104-45F4-850A-C1B78CA10A9D Ctonoxylon festivum Schedl Figs 13 , 14 , 16 , 17 , 19 , 20 Ctonoxylon festivum Schedl, 1941: 389 . Ctonoxylon dentigerum Schedl, 1941: 388 , syn. nov. Type material. Holotype , female: Kamerun , Soppo , 800 m , XII 1912 , v. Rothkirch S. G . Holotype of C. dentigerum , male: Spanish Guinea [ Equatorial Guinea ]. [both in NHMW ] . Diagnosis. Length 3.1–3.2 mm . 2.1–2.2 × as long as broad; colour brown. Upper and lower eye parts separated by more than width of upper part; pronotal eye scraper acutely pointed; a sharp carina running from scraper to procoxa, without associated groove or propleural pit; scutellar shield at level with elytra; striae slightly impressed; main interstrial setae and ground vestiture similar and evenly distributed, each seta a little shorter than width of an interstriae; elytral apex slightly emarginated; resting position of mesotibiae marked on metaventrite. Distribution. Cameroon , Equatorial Guinea , Tanzania (new country record). New record. Tanzania , Morogoro , Kimboza Forest Reserve [GIS: - 7.023 , 37.806 ], S. S. Madoffe, leg. [1, NHMUK ]. Comments. Using the principle of first reviser the name festivum is given priority as there is nothing particularly dentigerous about this species. Differences noted between the holotypes of C. dentigerum and C. festivum are likely due to sexual dimorphism, with the male dentigerum having the anterior pair of teeth on pronotum a little behind the anterior margin and in festivum along the front margin. Minor variation in the length of elytral setae can also be due to dimorphism, or simply due to variation between individuals as often observed in similar species. Biology unknown, except collected in low- to mid-altitude rainforest. Figures 12–20. Dorsal, lateral, and front views of 12, 15, 18 Ctonoxylon hirtellum male holotype 13, 16, 19 Ctonoxylon festivum female holotype, and 14, 17, 20 Ctonoxylon dentigerum male holotype, syn. nov. (= Ctonoxylon festivum ).