A revision of the Neotropical genus Coptoborus Hopkins (Coleoptera, Curculionidae, Scolytinae, Xyleborini) Author Smith, Sarah M. https://orcid.org/0000-0002-5173-3736 Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA camptocerus@gmail.com Author Cognato, Anthony I. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA text ZooKeys 2021 2021-06-16 1044 609 720 http://dx.doi.org/10.3897/zookeys.144.62246 journal article http://dx.doi.org/10.3897/zookeys.144.62246 1313-2970-1044-609 66F01A49D32448A8AC2669BF3374894C C96ED07B505A52A8ADA354E1F70BB7C0 Coptoborus semicostatus (Schedl, 1948) comb. nov. Figure 15G-I, O Xyleborus semicostatus Schedl, 1948: 268. Dryocoetoides semicostatus (Schedl): Wood and Bright 1992 : 658. Type material. Holotype (NHMW), examined. New records. Bolivia: Santa Cruz Dist., Portrerillo del Guenda, Preserva Natural, 17°40'S , 63°27'W , 370 m, 12-13.x.2007, A.R. Cline & J.E. Wappes, ex BL/MV (CSCA, 2). Diagnosis. 2.8-3.1 mm (mean = 3.0 mm; n = 3), 2.6-2.7 x as long as wide. This species is distinguished by the declivital interstriae raised into vermiculate ridges as high as 2 x strial width, declivity subshiny and smaller size, 3.1 mm. Similar species. C. starbuck , Dryocoetoides spp. Distribution. Bolivia* (Santa Cruz), Brazil (Mato Grosso do Sul). Biology. Unknown. Remarks. The species was undoubtedly placed in Dryocoetoides by Wood and Bright (1992) because of its costate interstriae, a usually diagnostic character for Dryocoetoides combined with an inflated and granulate posterior face of the protibia. However, the only previously known specimen, the holotype, is point mounted with an excessive amount of glue making it impossible to properly see the protibia. The protibiae are clearly visible on the Bolivian specimens and the posterior face is flat and unarmed. This species is therefore transferred to Coptoborus .