Cnestus gravidus (Blandford, 1898)

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 gravidus (Blandford, 1898) Fig. 32G, H, L

Xyleborus gravidus Blandford, 1898: 427.

Xylosandrus gravidus (Blandford): Wood and Bright 1992: 796.

Cnestus gravidus (Blandford): Dole and Cognato 2010: 529.

Type material.

Holotype (NHMUK).

New records.

India: Arunachal Pradesh, Etalin vicinity, 28°36'56"N, 95°53'21"E, 700 m, 12-25.v.2012, L. Dembický (ZFMK, 9). Laos: Vientiane, Phou Kou Khouei, 800 m, 12-13.iv.1965, J.L. Gressitt (BPBM, 1). Vietnam: Cao Bang, Phia Oac hotel, 22°37.702'N, 105°54.5467'E, 847 m, 10-17.iv.2014, VN1, Cognato, Smith, Pham, ex in flight (MSUC, 2). NE region, Hanoi, Ba Vi Nat. Park, 16-18.vi.2016, 21°04.821'N, 105°22.034'E, G.S. Powell (MSUC, 1); as previous except: VQG Ba Vi, 400 m, 2.vi.2001 (MSUC, 1).

Diagnosis.

5.0-5.5 mm long (mean = 5.34 mm; n = 5); 1.83-2.0 × as long as wide. This species is distinguished by the presence of a mesonotal mycangial tuft on the pronotal base; elytral disc short; declivity obliquely truncate; pronotum type 1 when viewed dorsally; antennal club type 2, with two sutures visible on posterior face; antennal funicle 4-segmented; protibiae distinctly triangular; procoxae narrowly separated; declivital posterolateral margin strongly carinate from apex to declivital base along interstriae 7; declivital interstriae granulate with a median row of long erect hair-like setae, clearly distinct from the ground vestiture; pronotal disc glabrous, shiny, sparsely punctate; and typically bicolored pronotum with apical 1/2 black and basal 1/2 orange.

Similar species.

Cnestus ater , C. improcerus , C. mutilatus , C. testudo .

Distribution.

Bangladesh, China (Hainan, Xizang, Yunnan), India (Arunachal Pradesh*, Assam, Sikkim, West Bengal), Laos, Myanmar, Nepal, Sri Lanka, Thailand, Vietnam.

Host plants.

Polyphagous ( Beeson 1961).

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).