Cnestus aterrimus (Eggers, 1927)

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

Cnestus aterrimus (Eggers, 1927) Fig. 32C, D, J

Xyleborus aterrimus Eggers, 1927a: 400.

Cnestus aterrimus (Eggers): Browne 1961b: 173.

Xyleborus glabripennis Schedl, 1942a: 189. Synonymy: Schedl 1958c: 145; Browne 1961b: 173.

Tosaxyleborus pallidipennis Murayama, 1950: 49. Synonymy: Smith et al. 2018b: 394.

Cnestus nitens Browne, 1955: 358. Synonymy: Schedl 1958c: 145.

Cnestus murayamai Schedl, 1962a: 207 (new name for C. pallidipennis Murayama nec Eggers 1940). Synonymy: Smith et al. 2018b: 394.

Cnestus murayamai Browne, 1963: 54 (new name for C. pallidipennis Murayama nec Eggers 1940). Synonymy: Smith et al. 2018b: 394.

Cnestus pseudosuturalis Schedl, 1964c: 315. Synonymy: Hulcr and Cognato 2013: 58.

Cnestus maculatus Browne, 1983b: 33. Synonymy: Smith et al. 2018b: 394.

Type material.

Syntypes Tosaxyleborus pallidipennis (NMNH, 4). Paratype Cnestus maculatus (NHMUK). Lectotype Cnestus pseudosuturalis (NHMW).

New records.

China: Fujian, Quanzhou, 23.xi.2015, Y. Li, ex mango (UFFE, 1). Chongqing, Jinfo Mtn, 10.v.2016, Tian-Shang, Lv-Jia (RABC, 1); as previous except: Peng Shui, 10.v.2015, Tian-Shang, ex Castanea mollissima (RABC, 1). Hong Kong, Tai Po Kau, vi.2017, J. Skelton (MSUC, 1). Yunnan, S, 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, 10; RABC, 3); as previous except: 20 km NW Jinghong, vic. Man Dian (NNNR), 22°07.80'N, 100°40.0'E, 740 m, rubber plantation, 23.v.2008, A. Weigel (RABC, 3); as previous except: forest, EKL, 10.x.2008; as previous except: S, Jinghong, Tian Zi garden, EKL, 15.xii.2007, A. Weigel (RABC, 2); as previous except: 37 km NW Jinghong, vic. Guo Men Shan, 22°14.48'N, 100°36.22'E, 1080 m, forest, 6.iv.2009, L. Meng (RABC, 2). Laos: Bolikhamxai, Ban nape (8 km NE), 18°21'N, 105°08'E, 600 m, 1-18.v.2001, V. Kubáň (RABC, 2). Louangnamtha, Namtha to Muang Sing, 21°09'N, 101°19'E, 900-1200 m, 5-31.v.1997, V. Kubáň (NHMB, 2). Vietnam: Hoa Binh, 1940, A. DeCooman (MNHN, 1). Lao Cai, Hoang Lien N.P., 22.35, 103.77, 1500-2000 m, 17.v.2019, VN202, S.M. Smith, A.I. Cognato, ex twigs (MSUC, 1). Tuyen Quang, Doi Can Tuyen Quang, 21.72740, 105.22742, 15.iv.2015, R.J. Rabaglia, ex funnel trap (RJRC, 1). Vinh Phuc, Dai Lai, Acacia hybrid plantation, alcohol lure, 11.i.2010, J. King (QDAFB, 1).

Diagnosis.

1.8-2.6 mm long (mean = 2.34 mm; n = 5); 2.09-2.36 × as long as wide. This species is distinguished by the presence of a mesonotal mycangial tuft on the pronotal base; declivity rounded; elytra typically with a transparent area (may also be solid black); pronotum from dorsal view basic (type 1); antennal club type 1, with no sutures visible on the posterior face; antennal funicle 3-segmented; protibiae obliquely triangular; declivital striae with punctures similar to those of disc; and declivital interstriae 2 and 3 not narrowed toward apex, at most striae 1 and 2 impressed.

This species strongly resembles C. suturalis which has much coarser declivital strial punctures that are deeper than those of disc, interstriae 2 and 3 strongly narrowed toward apex, striae 1-3 impressed.

Similar species.

Cnestus suturalis .

Distribution.

China (Chongqing*, Fujian*, Hainan, Hong Kong*, Hubei, Hunan, Sichuan, Xizang, Yunnan*), Indonesia (Java, Sumatra), Japan, Laos*, West Malaysia, New Guinea, South Korea, Taiwan, Thailand, Vietnam.

Host plants.

Polyphagous ( Browne 1961b).

Remarks.

Browne (1961b) describes the gallery system and biology.

Figures

Figure 32. Dorsal, lateral and declivital view of Cnestus ater (holotype Xyleborus retusiformis), 3.9 - 4.1 mm (A, B, I), C. aterrimus (lectotype C. pseudosuturalis), 1.8 - 2.6 mm (C, D, J), C. bicornioides holotype, 3.3 - 3.7 mm (E, F, K), and C. gravidus, 5.0 - 5.5 mm (G, H, L).