Cnestus quadrispinosus Sittichaya & Beaver, 2018

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 quadrispinosus Sittichaya & Beaver, 2018 Fig. 34A, B, G

Cnestus quadrispinosus Sittichaya & Beaver, 2018: 32.

Type material.

Holotype (NHMW), paratypes (MSUC, 1; NHMUK, 1; NHMW, 2; RABC, 2)

Diagnosis.

3.45-4.5 mm long (mean = 4.1 mm; n = 4); 2.2-2.56 × as long as wide ( Sittichaya and Beaver 2018). This species is distinguished from all other Cnestus by the presence of four large spines (two per elytron), one large spine at the declivital summit on interstriae 3 and a second large spine on interstriae 5 on the lateral margin of the declivity. It can be further distinguished by the absence of a mesonotal mycangial tuft on the pronotal base; declivity unarmed; elongate body; declivity excavated; pronotum from dorsal view type 6; pronotum apex strongly produced, extending to a process with two serrations; mandibles normal; epistoma entire; elytral punctures distinct, clearly uniseriate; interstriae bearing sparse erect hair-like setae; declivital interstriae 2-5 sparsely denticulate; protibiae obliquely triangular very slender with six or seven, narrow denticles on outer margin; antennal club type 1, with no sutures visible on the posterior face; and 3-segmented antennal funicle.

Similar species.

Cnestus bicornioides , Cnestus bicornis (from Indomalayan region).

Distribution.

Brunei, East Malaysia, Thailand.

Host plants.

Unknown but has been collected from dipterocarp forests ( Sittichaya and Beaver 2018).

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).