Diuncus corpulentus (Eggers, 1930)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

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. Dembický, ex FIT (ZFMK, 1). Assam-Arunachal Pradesh border, Bhalukpong, 27°00'48"N, 92°39'08"E, 150 m, 1-8.v.2012, L. Dembický, ex FIT (ZFMK, 2). Meghalaya, 3 km E Tura, 25°30'N, 90°14'E, 1150 m, 4.v.1999, Dombický & Pacholátko (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 × 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.

Figures

Figure 49. Dorsal, lateral and declivital view of Diuncus ciliatoformis lectotype, 1.65 - 1.95 mm (A, B, I), D. corpulentus, 1.6 - 3.2 mm (C, D, J), D. dossuarius, 2.6 mm (E, F, K), and D. haberkorni, 1.9 - 2.8 mm (G, H, L).