A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China Author Smith, Sarah M. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA https://orcid.org/0000-0002-5173-3736 camptocerus@gmail.com Author Beaver, Roger A. 161 / 2 Mu 5, Soi Wat Pranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand Author Cognato, Anthony I. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA text ZooKeys 2020 983 1 442 http://dx.doi.org/10.3897/zookeys.983.52630 journal article http://dx.doi.org/10.3897/zookeys.983.52630 1313-2970-983-1 7DED4CE2934C4539945F758930C927F9 C890C7FD4B2D57A8B1A062305ED42D53 Cyclorhipidion japonicum (Nobuchi, 1981) Fig. 42C, D, J Xyleborus japonicus Nobuchi, 1981a: 153. Cyclorhipidion japonicum (Nobuchi): Smith et al. 2018b : 394. Type material. Holotype (NIAES). New records. China: [unspecificed province], northeastern China, DB07, A56, Wang (RJRC, 1). S. Yunnan, Xishuangbanna, 28 km NW Jinghong, vic. An Ma Xi Zhan (NNNR), 22°12'N , 100°38'E , 700 m, forest, 25.iii.2009, L. Meng (RABC, 1); as previous except: 23 km NW Jinghong, vic. Na Ban (NNNR), 22°09.49'N , 100°39.92'E , 730 m, rubber plantation, 15.vi.2008, A. Weigel (RABC, 1). Thailand: Chiang Mai, Doi Pui, 1400 m, 18-22.x.2004, W. Puranasakul, ex EtOH trap (RABC, 2); as previous except: 6-27.vi.2005 (RABC, 1). [Chaiyaphum], Phu Khieo N.P., branch, vii.2005, Hulcr et al. (RABC, 1). Diagnosis. 2.1-2.3 mm long (mean = 2.2 mm; n = 4); 2.81-3.5 x as long as wide. This species is distinguished by the small size; declivity obliquely truncate, moderately to strongly sulcate; pronotum elongate from dorsal view (type 9); declivity laterally sulcate to interstriae 3, interstriae 3 bearing five tubercles along its length. Similar species. Cyclorhipidion neocavipenne , C. xeniolum . Distribution. China* (Yunnan), Japan, Russia (Far East), South Korea, Thailand*. Host plants. Recorded only from Castanopsis and Quercus ( Fagaceae ) ( Nobuchi 1981a ).