Diuncus haberkorni (Eggers, 1920)

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 haberkorni (Eggers, 1920) Fig. 49G, H, L

Xyleborus haberkorni Eggers, 1920: 43.

Diuncus haberkorni (Eggers): Hulcr and Cognato 2009: 31.

Xyleborus approximatus Schedl, 1951a: 77. Synonymy: Hulcr and Cognato 2013: 80.

Xyleborus taichuensis Schedl, 1952b: 64. Synonymy: Beaver and Liu 2010: 26.

Xyleborus potens Schedl, 1964a: 298. Synonymy: Schedl 1975e: 35 (as synonym of X. approximatus ).

Type material.

Lectotype Xyleborus haberkorni (NMNH). Paratype Xyleborus taichuensis (NHMW).

New records.

China: Fujian, Fuan, Shuyang, 2.x.2018, A. Ernstsons, ex EtOH trap (MSUC, 1). Guangdong, Shenzhen, 11.iv.2018, Y. Li (UFFE, 1). Guangxi, Shiwandashan, 25.iii.2018, Y. Li (UFFE, 1). Hong Kong, Kadoorie Farm, vi.2017, J. Skelton (UFFE, 1). Jiangxi, Gan Zhou, 5.vii.2015, Lv-Jia (RABC, 1); as previous except: Nan Chang, 22.vi.2016, ex Cinnamomum camphora (RABC, 1); as previous except: 18.vi.2016, ex Ligustrum lucidum (RABC, 1). Yunnan, Xishuangbanna, 23 km NW Jinghong, vic. Na Ban village (NNNR), 22°10'N, 100°39'E, 700-1000 m, v-vii. 2009, L. Meng (NKME, 1); as previous except: 25 km NW Jinghong, vic. Zhang Zhi Chang (NNNR), 22°11.06'N, 100°39.05'E, 780 m, rubber plantation, EKL, 15.vi.2008, A. Weigel (NKME, 1); as previous except: 28 km NW Jinghong, vic. An Ma Xi Zhan (NNNR), 22°12'N, 100°38'E; 700 m, forest, EKL, 30.x.2008 (NKME, 2). India: Assam-Arunachal Pradesh border, Bhalukpong, 27°00'48"N, 92°39'08"E, 150 m, 1-8.v.2012, L. Dembický, ex FIT (ZFMK, 1). Laos: Vientiane, ii.1965, J.L. Gressitt, ex light trap (BPBM, 1). Vientiane, Ban Van Eue, 30.iii.1967, native collector (BPBM, 1). Vietnam: Dong Nai, Cat Tien N.P., 11.40817, 107.38098, 134 m, 20-22.ii.2017, VN81, A.I. Cognato, T.A. Hoang, ex FIT (MSUC, 14). Ninh Binh, Doi Vac, Cuc Phuong, 10-16.ix.2013, J.B. Heppner (FSCA, 1). Yen Bai, Mau A, 21.88226, 104.68040, 15.iv.2015, R.J. Rabaglia, ex funnel trap (RJRC, 1).

Diagnosis.

1.9-2.8 mm long (mean = 2.28 mm; n = 5); 2.11-2.38 × as long as wide. This species is distinguished by the elytral summit armed by two pairs of large denticles, one pair on interstriae 2 and the other on interstriae 3; pronotum approximately as long as wide, summit at midpoint, basal 1/2 punctate; declivity appearing weakly bisulcate; and interstriae 1 and 3-6 flat to weakly convex giving the declivity a finely sculptured appearance.

Similar species.

Diuncus mucronatus , D. mucronatulus , D. quadrispinulosus .

Distribution.

Bangladesh, China (Fujian*, Guangdong*, Guangxi*, Hainan, Hong Kong*, Jiangxi*, Yunnan*), India (Andaman Is, Assam, Arunachal Pradesh*, Tamil Nadu, Uttarakhand, West Bengal), Indonesia (Java), Japan (Ryukyu Is), East & West Malaysia, New Guinea, South Korea, Sri Lanka, Taiwan, Thailand, Vietnam. Imported to Africa (South Africa, Tanzania).

Host plants.

Polyphagous ( Beeson 1930; Browne 1961b). The species is sometimes associated with other xyleborines ( Beaver and Browne 1979; Hulcr and Cognato 2010b), but may also occur alone ( Hulcr and Cognato 2009).

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).