Cnestus suturalis (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

Cnestus suturalis (Eggers, 1930) Fig. 34C, D, H

Xyleborus suturalis Eggers, 1930: 200.

Cnestus suturalis (Eggers): Wood and Bright 1992: 803.

Type material.

Holotype (FRI), paratype (NMNH, 1).

New records.

China: Guizhou, Guiyang, Huaxi, 8.iv.2015, Y. Li, ex in flight (UFFE, 1). Yunnan, Yulongshan mts., Ganhaizi pass, 27°06'N, 100°15'E, 3000-3500 m, 18-23.vii.1990, V. Kubáň (NHMB, 1; RABC, 1).

Diagnosis.

2.8 mm long (mean = 2.8 mm; n = 2); 2.55 × as long as wide. This species is distinguished by the presence of a mesonotal mycangial tuft on the pronotal base; declivity rounded; elytra often with a transparent area; pronotum from dorsal view 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 much coarser, deeper than those of disc; declivital interstriae 2 and 3 strongly narrowed toward apex; and striae 1-3 impressed.

This species strongly resembles C. aterrimus which has declivital strial punctures similarly sized to those of disc, interstriae 2 and 3 not narrowed toward apex, and at most striae 1 and 2 impressed.

Similar species.

Cnestus aterrimus .

Distribution.

China* (Guizhou, Yunnan), India (Andaman Is, Meghalaya), Indonesia (Java), Vietnam.

Host plants.

Recorded from Eupatorium ( Asteraceae ), Terminalia ( Combretaceae ), Swietenia ( Meliaceae ) and Piper ( Piperaceae ), and presumed polyphagous ( Beeson 1961; Kalshoven 1959b).

Figures

Figure 34. Dorsal, lateral and declivital view of Cnestus quadrispinosus paratype, 3.45 - 4.5 mm (A, B, G), C. suturalis paratype, 2.8 mm (C, D, H), and C. testudo, 4.2 - 4.4 mm (E, F, I).