One hundred eighteen taxonomic changes among Xyleborine ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) Author Smith, Sarah M. 0000-0002-5173-3736 Department of Entomology, Michigan State University, 288 Farm Lane, 243 Natural Science Bldg., East Lansing, MI 48824, USA. smith 462 @ msu. edu; https: // orcid. org / 0000 - 0002 - 5173 - 3736 smith462@msu.edu Author Beaver, Roger A. 161 / 2 Mu 5, Soi Wat Pranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand. Author Sittichaya, Wisut 0000-0001-6200-1285 Agricultural Innovation and Management Division, Faculty of Natural Resources, Prince of Songkla University, Songkhla, 90110, Thailand. wanakorn 62 @ hotmail. com; https: // orcid. org / 0000 - 0001 - 6200 - 1285 & Department of Entomology, Michigan State University, 288 Farm Lane, 243 Natural Science Bldg., East Lansing, MI 48824, USA. cognato @ msu. edu; https: // orcid. org / 0000 - 0001 - 6436 - 2447 wanakorn62@hotmail.com text Zootaxa 2022 2022-10-05 5194 2 151 175 journal article 158408 10.11646/zootaxa.5194.2.1 ca4aa334-4646-495b-9116-1766a7376728 1175-5326 7147098 C6F3069F-6EC1-4FAC-8870-FC0B53BD45EF Cyclorhipidion impar (Eggers, 1927) comb. nov. Xyleborus impar Eggers, 1927b: 89 . Remarks. The males of most xyleborines are much smaller than the females, weakly sclerotized, with reduced eyes and non-functional hind wings. However, in a few genera, e.g. Cyclorhipidion , this is not the case. The males of Cyclorhipidion can be recognised by their relatively large size, well-sclerotized body, and characteristic habitus. The head is large, semiprognathous, the mandibles large and powerful, but the eyes and antennae reduced in size relative to the female. The pronotum is elongate, usually as long as or longer than the elytra, widest in the anterior quarter, the sides straight or slightly emarginate, the posterior angles rounded, convex dorsally without an impression anteriorly, nor a median projection of the anterior margin. The elytra are relatively short, rounded posteriorly, the declivity convex without distinct sculpture. The protibiae are curved with a row of strong, socketed teeth on the outer margin extending almost to the base. The description of Xyleborus impar indicates that it clearly possesses the characteristics of Cyclorhipidion males, and the species is here transferred to that genus. The female of C. impar is likely to have been described under a different name. However, males of the great majority of species of Cyclorhipidion are still unknown, and male and female need to be collected in association for a definite association to be made. Distribution. Philippines .