Microperus undulatus (Sampson, 1919)

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 undulatus (Sampson, 1919) Fig. 70C, D, F

Xyleborus undulatus Sampson, 1919: 111.

Coptodryas undulata (Sampson): Wood 1989: 171.

Microperus undulatus (Sampson): Saha and Maiti 1996: 827.

Xyleborus leprosulus Schedl, 1936d: 27. Synonymy: Wood 1989: 171.

Type material.

Holotype Xyleborus undulatus (NHMUK).

Diagnosis.

2.0-2.1 mm long (mean = 2.03 mm; n = 3); 2.5-2.86 × as long as wide. This species is distinguished by the elytral disc shallowly transversely impressed with a saddle-like depression; elytral interstriae flat with moderate interstrial tubercles posterior to the saddle; and declivity steep, slightly flattened.

Microperus undulatus closely resembles M. sagmatus but is distinguished by the discal impression shallower, antero-posteriorly broader, with gentler anterior and posterior slopes, strial punctures on impression without granules, interstrial tubercles on disc behind saddle moderately sized with rounded apices pointing dorsally, not backwardly hooked.

Similar species.

Microperus cruralis , M. nugax , M. sagmatus .

Distribution.

India (West Bengal), Indonesia (Java), West Malaysia, Nepal, Thailand.

Host plants.

Recorded only from two species of Shorea ( Dipterocarpaceae ) ( Beeson 1930; Browne 1961b).

Figures

Figure 70. Dorsal, lateral and declivital view of Microperus sagmatus holotype, 1.75 - 1.95 mm (A, B, E), and M. undulatus, 2.0 - 2.1 mm (C, D, F).