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 Diuncus corpulentus (Eggers, 1930) Fig. 49C, D, J Xyleborus corpulentus Eggers, 1930: 198. Diuncus corpulentus (Eggers): Hulcr and Cognato 2009 : 30. Type material. Holotype (FRI). New records. China: Hainan, Wu-zhi-shan Town, 18.902N , 109.663E , 703 m, 2.xii.2016, Tian-Shang & Lv-Jia (RABC, 1). S-Yunnan, Xishuangbanna, 37 km NW Jinghong, vic. Guo Men Shan, 22°14.48'N , 100°36.22'E , 1080 m, 10.x.2008, UWP MF, 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, second[ary] for[est], 6.vi.2008, GS, A. Weigel (RABC, 1). Xishuangbanna, 23 km NW Jinghong, vic. Na Ban village (NNNR), 22°10'N , 100°39'E , 700-1000 m, v-vii.2009, L. Meng (RABC, 1). India: Arunachal Pradesh, Hunli, 28°19'32"N , 95°57'31"E , 1300 +/- 100 m, 26.v-1.vi.2012, L. Dembicky , ex FIT (ZFMK, 1). Assam-Arunachal Pradesh border, Bhalukpong, 27°00'48"N , 92°39'08"E , 150 m, 1-8.v.2012, L. Dembicky , ex FIT (ZFMK, 2). Meghalaya, 3 km E Tura, 25°30'N , 90°14'E , 1150 m, 4.v.1999, Dombicky & Pacholatko (RABC, 1). Laos: Vientiane, Ban Van Eue, 15-31.v.1965, native collector (BPBM, 1). Taiwan: Nantou, Sun Moon Lake, 8.vii.2016, C.-S. Lin (MSUC, 1). Vietnam: Lao Cai, Hoang Lien N.P., 22.35, 103.77, 1500 m, 17.v.2019, VN152, S.M. Smith, A.I. Cognato, ex branch; 1-3 cm (MSUC, 2). Ninh Binh, Cuc Phuong N.P., 20.33296 , 105.61259 , 7.iii.2018, 279 m, A.I. Cognato, S.M. Smith, VN 147, ex 3-4 cm diameter branch from tree fall; red latex (MSUC, 1). Diagnosis. 1.6-3.2 mm long (mean = 2.66 mm; n = 5); 1.33-2.31 x as long as wide. This species is distinguished by the elytral disc convex; declivital summit armed by three denticles along interstriae 2; declivital interstriae 3, 5, and 6 bearing a uniseriate row of denticles along its length; interstrial setae minute, strongly confused, recumbent, as long as length between setae; and bicolored elytra and pronotum that are darker at the apical areas. Similar species. Diuncus dossuarius , D. javanus . Distribution. China (Hainan, Xizang, Yunnan*), India (Andaman Is, Arunachal Pradesh*, Assam, Meghalaya*, West Bengal), Laos, Nepal, Taiwan, Thailand, Vietnam*. Host plants. Polyphagous ( Beeson 1930 ; Maiti and Saha 2004 ). Hulcr and Cognato (2009) found it in association with Hadrodemius globus in Thailand.