Diuncus quadrispinosulus (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

Diuncus quadrispinosulus (Eggers, 1923) Fig. 51A, B, C

Xyleborus quadrispinosulus Eggers, 1923: 189.

Diuncus quadrispinosulus (Eggers): Hulcr and Cognato 2009: 34.

Xyleborus parvispinosus palembangensis Schedl, 1939b: 43. Synonymy: Schedl 1958c: 147.

Xyleborus parvispinosus Schedl, 1951a: 78. Synonymy: Schedl 1958c: 147.

Type material.

Holotype Xyleborus quadrispinosulus (MCG).

New records.

Thailand: Narathiwat, Hala-Bala Wildlife Sanct., 5°47'44"N, 101°50'07"E, lowland TRF [tropical rain forest], 1.ii.2015, W. Sittichaya (RABC, 1). Vietnam: N [Tuyen Quang], 160 km NNW Hanoi, NE env. of Na Hang, 150-200 m, 3-13.vi.1996, A. Napolov & I. Roma (RABC, 2).

Diagnosis.

1.8-1.9 mm long (mean = 1.82 mm; n = 5); 2.25-2.57 × as long as wide. This species is distinguished by the elytral summit armed by two pairs of minute denticles, one pair on interstriae 2 and the other on interstriae 3.

Similar species.

Diuncus haberkorni , D. mucronatus , D. mucronatulus .

Distribution.

Indonesia (Java, Sumatra), East & West Malaysia, Myanmar, New Guinea, Thailand, Vietnam*.

Host plants.

Polyphagous ( Browne 1961b).

Figures

Figure 51. Dorsal, lateral and declivital view of Diuncus quadrispinulosus, 1.8 - 1.9 mm (A-C).