Xyleborinus spinipennis (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

Xyleborinus spinipennis (Eggers, 1930) Fig. 86A, B, I

Xyleborus spinipennis Eggers, 1930: 202.

Xyleborinus spinipennis (Eggers): Wood and Bright 1992: 817.

Type material.

Holotype (FRI).

New records.

China: Sichuan, Mt. Emei, 1000 m, 4-20.v.1989, V. Kubáň (RABC, 1); as previous except: 600-1050 m, 5-19.v.1989, L. Bocák (NHMB, 1). Nepal: W., Dhawalagiri, Parbat Distr., Karkineta-Nagdanda, 1600 m, 3.vii.1986, C. Holzschuh (RABC, 1). Vietnam: Cao Bang, 22°36.402'N, 105°52.397'E, 1601 m, 13.iv.2014, VN17, Cognato, Smith, Pham, ex standing stump (MSUC).

Diagnosis.

2.3-2.75 mm long (mean = 2.56 mm; n = 5); 2.83-2.89 × as long as wide. This species is distinguished by the elytra parallel-sided in basal 1/2, tapering posteriorly; declivital face with interstriae 1 and 2 unarmed by tubercles; declivital face moderately sulcate; small body size; lateral declivital margins moderately elevated, costate, bearing 4-6 pairs of large sharply pointed backwardly hooked denticles (often asymmetric); strial punctures large; elytra with small denticles on interstriae 1-4 not extending further than the declivital summit; declivital surface shagreened, dull; and elongate body form.

This species is very similar to X. cuneatus and is distinguished by the larger size, less elongate form, elytra with small denticles on interstriae 1-4 not extending further than the declivital summit, pronotum less elongate, 1.14 × as long as wide.

Similar species.

Xyleborinus artestriatus , X. cuneatus , X. echinopterus , X. ephialtodes , X. octiesdentatus , X. schaufussi , X. speciosus .

Distribution.

China* (Sichuan), India (Assam), Nepal*, Vietnam*.

Host plants.

Unknown.

Remarks.

Eggers (1930) stated that the species was 2.0 mm long in his description. The holotype was measured by S.L. Wood and was found to be 2.4 mm long.

Figures

Figure 86. Dorsal, lateral and declivital view of Xyleborinus spinipennis, 2.3 - 2.75 mm (A, B, I), X. subgranulatus, 1.6 - 1.8 mm (C, D, J), X. subspinosus holotype, 2.3 mm (E, F, K), and X. thaiphami holotype, 2.8 - 2.9 mm (G, H, L).