Microperus nugax (Schedl, 1939)

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

Microperus nugax (Schedl, 1939) Fig. 68G, H, L

Xyleborus nugax Schedl, 1939a: 353.

Coptodryas nugax (Schedl): Wood 1989: 171.

Microperus nugax (Schedl): Hulcr 2010: 112.

Xyleborus pertuberculatus Eggers, 1940: 144. Synonymy: Kalshoven 1959a: 97.

Type material.

Lectotype (NHMW).

New records.

Vietnam: Dong Nai, Cat Tien N.P., 11.42232, 107.42834, 128 m, 25.ii.2017, VN105, A.I. Cognato, T.A. Hoang, ex 10 cm diameter branch (MSUC, 2).

Diagnosis.

1.8-1.9 mm long (mean = 1.84 mm; n = 4); 2.57-2.71 × as long as wide. This species is distinguished by the declivital interstriae densely covered with long erect hair-like setae; elytral disc medially convex, appearing humped; declivity long, gradual; all declivital interstriae uniformly granulate from base to apex; declivital face convex; posterolateral carina granulate; antennal club flat, type 3 with two sutures visible on posterior face; and declivity shagreened, dull.

Similar species.

Microperus cruralis , M. sagmatus , M. undulatus .

Distribution.

‘Borneo’, Brunei, Indonesia (Java, Sulawesi), East & West Malaysia, Thailand, Vietnam*.

Host plants.

Polyphagous ( Browne 1961b).

Figures

Figure 68. Dorsal, lateral and declivital view of Microperus latesalebrinus holotype, 1.6 mm (A, B, I), M. minax holotype, 1.95 - 2.0 mm (C, D, J), M. nudibrevis, 1.5 - 1.6 mm (E, F, K), and M. nugax, 1.8 - 1.9 mm (G, H, L).