Diuncus ciliatoformis (Schedl, 1953) stat. res.

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 ciliatoformis (Schedl, 1953) stat. res. Fig. 49A, B, I

Xyleborus ciliatoformis Schedl, 1953d: 81.

Diuncus ciliatoformis (Schedl): Hulcr and Cognato 2009: 32.

Type material.

Lectotype (NHMW).

New records.

China: Chongqing, Pengshui, 11.viii.2016, Tian-Shang (RABC, 1); Guizhou, Guiyang, East temple, viii.2015, Su, T-L. (RABC, 1).

Diagnosis.

1.65-1.95 mm long (mean = 1.78 mm; n = 5); 2.36-2.62 × as long as wide. This species is distinguished by the minute size; unarmed declivity; moderately impressed declivital striae 1; declivity densely covered by recumbent setae on the striae and interstriae; and lateral margin of the protibiae armed with four denticles.

Similar species.

Diuncus justus .

Distribution.

China* (Chongqing, Guizhou), East & West Malaysia, New Guinea, Taiwan, Thailand.

Host plants.

Recorded from Shorea , Vatica ( Dipterocarpaceae ) and Lithocarpus ( Fagaceae ). Browne (1961b) suggests a preference for Dipterocarpaceae .

Remarks.

This species had previously been considered a synonym of D. justus by Hulcr and Cognato (2013). It is here removed from synonymy and reinstated as a distinct species. It is distinguished from D. justus by the moderately impressed declivital striae 1 and the declivity densely covered by recumbent setae on the striae and interstriae.

Figures

Figure 49. Dorsal, lateral and declivital view of Diuncus ciliatoformis lectotype, 1.65 - 1.95 mm (A, B, I), D. corpulentus, 1.6 - 3.2 mm (C, D, J), D. dossuarius, 2.6 mm (E, F, K), and D. haberkorni, 1.9 - 2.8 mm (G, H, L).