Diuncus javanus (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 javanus (Eggers, 1923) Fig. 50A, B, I

Xyleborus javanus Eggers, 1923: 188.

Diuncus javanus (Eggers): Hulcr and Cognato 2009: 32.

Xyleborus perdix Schedl, 1939a: 351. Synonymy: Schedl 1960b: 109.

Type material.

Lectotype Xyleborus javanus (NMNH).

Diagnosis.

2.5-2.7 mm long (mean = 2.62 mm; n = 5); 2.08-2.25 × as long as wide. This species is distinguished by the elytral summit transversely impressed with a saddle-like depression; declivital base armed by two pairs of denticles, one pair on interstriae 2 and the other on interstriae 3; bicolored elytra and pronotum that are darker on the apical areas; declivital interstrial setae recumbent, thick, scale-like, in uniseriate rows; and striae glabrous.

Similar species.

Diuncus corpulentus , D. dossuarius .

Distribution.

Brunei, Indonesia (Java, Sumatra, Sulawesi), East & West Malaysia, Philippines, Thailand.

Host plants.

Polyphagous ( Kalshoven 1959b; Browne 1961a).

Figures

Figure 50. Dorsal, lateral and declivital view of Diuncus javanus, 2.5 - 2.7 mm (A, B, I), D. justus, 1.5 - 1.7 mm (C, D, J), D. mucronatulus holotype, 1.5 mm (E, F, K), and D. mucronatus, 2.0 - 2.5 mm (G, H, L).