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).