Cnestus ater (Eggers, 1923)

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 ater (Eggers, 1923) Fig. 32A, B, I

Xyleborus ater Eggers, 1923: 210.

Xylosandrus ater (Eggers): Wood 1989: 177.

Cnestus ater (Eggers): Dole and Cognato 2010: 528.

Xyleborus retusiformis Schedl, 1936d: 31. Synonymy: Wood 1989: 177.

Type material.

Holotype Xyleborus retusiformis (NHMW).

Diagnosis.

3.9-4.1 mm long (mean = 4.0 mm; n = 4); 1.63-1.70 × as long as wide. This species is distinguished by the presence of a mesonotal mycangial tuft on the pronotal base; elytral disc 4-5 × scutellum length; 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 obliquely triangular; procoxae narrowly separated; declivital posterolateral margin weakly carinate from apex to declivital base along interstriae 7; declivital interstriae weakly granulate, setose with five or six rows of recumbent hair-like setae on interstriae 2 and 3; striae indistinct on declivity, striae 1 and 2 impressed; discal punctures dense, confused, surface distinctly reticulate between punctures; and body black with basal part of pronotal disc sometimes orange or brown.

Similar species.

Cnestus gravidus , C. improcerus , C. mutilatus , C. testudo .

Distribution.

‘Borneo’, China (Fujian), Indonesia (Sumatra), East & West Malaysia.

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).