Xyleborinus artestriatus (Eichhoff, 1878)

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

Xyleborinus artestriatus (Eichhoff, 1878) Fig. 82C, D, J

Xyleborus artestriatus Eichhoff, 1878b: 507.

Xyleborinus artestriatus (Eichhoff): Saha and Maiti 1984: 4.

Xyleborus laticollis Blandford, 1896b: 226. Synonymy: Schedl 1958c: 152.

Xyelborus angustior [sic] Eggers, 1925: 158. syn. nov.

Xyleborus rugipennis Schedl, 1953b: 303. Synonymy: Wood 1989: 176.

Xyleborus undatus Schedl, 1974: 264. syn. nov.

Xyleborus beaveri Browne, 1979 (in Beaver and Browne 1979): 603. Synonymy: Beaver and Liu 2010: 30.

Type material.

Paratype Xyelborus angustior (NMNH). Holotype Xyleborus beaveri (NHMUK), paratypes (NHMUK, RABC). Holotype Xyleborus laticollis (NHMUK). Paratype Xyleborus undatus (NHMW).

New records.

Cambodia: Siem Reap, Preaj Khan temple, 26.vii.2006, O. Yothin, ex Malaise trap (IRSNB, 1). China: Hong Kong, Tai Po Kau, vi.2017, J. Skelton (MSUC, 2). S Yunnan, Xishuangbanna, 20 km NW Jinghong, vic. Man Dian (NNNR), 22°07.80'N, 100°40.05'E, 740 m, rubber plantation, 18.vi.2008, A. Weigel (RABC, 1); as previous except: 730 m, 15.vi.2008, EKL (NKME, 2); as previous except: 23 km NW Jinghong, vic. Na Ban (NNNR), 22°09.49'N, 100°39.92'E, 730 m, forest, 15.vi.2008, A. Weigel (RABC, 1); as previous except: rubber plantation (NKME, 2); as previous except: 25 km NW Jinghong, vic. Zhang Zhi Chang (NNNR), 22°11.06'N, 100°39.05'E, 780 m, rubber plant., 5.vi.2008, A. Weigel (RABC, 1); as previous except Hekou city, 3.vi.2014, Wang (RJRC, 2); as previous except Jinping city (RJRC, 1). Laos: 10 km N Luang-Prabang, Mekhong river, 240 km N Vientiane, hills c. 250 m, poor settlem[ent], prim[ary] veget[ation] lux, iii.1993, Insomsay Somsy (MFNB, 17); as previous except: iv.1993 (MFNB, 1). Wapikhamthong, Khong Sedone, Wapi, native collector, 15.iv.1967 (BPBM, 1); as previous except 30.viii.1967 (BPBM, 1). Taiwan: Nantou, Sun Moon Lake, 1.v.2014, C.-S. Lin (MSUC, 1). Vietnam: Lao Cai, Nam Tha, 22.01218, 104.37685, 9.v.2015, Pham Thu, ex funnel trap (RJRC, 1). Ninh Binh, Cuc Phuong N.P., Mac Lake, 20°15'29.0"N, 105°42'27.5"E, 155 m, 4-7.v.2009, J.B. Heppner, blacklight trap (FSCA, 1). Tuyen Quang, Doi Can Tuyen Quang, 21.72740, 105.22742, 15.iv.2015, R.J. Rabaglia, ex funnel trap (RJRC, 1). Vinh Phuc, Me Linh Biodiversity station, Dai Lai Lake, 27-29.ix.2013, 100 m, J.B. Heppner (FSCA, 1).

Diagnosis.

2.3-2.8 mm long (mean = 2.48 mm; n = 5); 2.3-3.13 × as long as wide. This species is distinguished by the posterior margin of elytra broadly rounded; declivital face with interstriae 1 and 2 unarmed by tubercles; declivital face weakly sulcate; large body size; lateral declivital margins elevated along interstriae 3, bearing two or three pairs of large, broad, obtusely pointed tubercles of different sizes on basal 1/2 of declivity; sulcate area of declivity smooth, shiny or opalescent; and stout body.

Similar species.

Xyleborinus echinopterus , X. ephialtodes , X. octiesdentatus , X. schaufussi , X. speciosus , X. spinipennis .

Distribution.

Recorded in the study region from Bangladesh, Cambodia*, China (Chongqing, Fujian, Guangdong, Guangxi, Hainan, Hong Kong*, Shanghai, Yunnan, unknown province), India (Madhya Pradesh, Sikkim, Uttarakhand, West Bengal), Laos, Myanmar, Taiwan, Thailand, Vietnam. It also occurs in Sri Lanka, and through the Indomalayan region to New Guinea and Australia and has been introduced to the United States ( Cognato et al. 2013; Gomez et al. 2018a).

Host plants.

Polyphagous ( Wood and Bright 1992).

Remarks.

In this species the gallery system is branched with several small brood chambers ( Browne 1961b).

The holotype of Xyelborus angustior is in poor condition; only the mesonotum and abdomen without elytra remain glued to the card. Eggers’ description clearly indicates that the specimen strongly resembled X. artestriatus before it became damaged. The species description and paratype specimen of Xyleborus undatus was also examined and found to be conspecific with X. artestriatus . Both species are here placed in synonymy with X. artestriatus .

Figures

Figure 82. Dorsal, lateral and declivital view of Xyleborinus andrewesi, 1.9 - 2.0 mm (A, B, I), X. artestriatus, 2.3 - 2.8 mm (C, D, J), X. attenuatus, 2.6 - 2.9 mm (E, F, K), and X. cuneatus holotype, 2.1 - 2.2 mm (G, H, L).