Fortiborus major (Stebbing, 1909)

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

Fortiborus major (Stebbing, 1909) Fig. 60C, D, H

Phloeosinus major Stebbing, 1909: 19.

Xyleborus major (Stebbing): Stebbing 1914: 590.

Notoxyleborus major (Stebbing): Maiti and Saha 1986: 100.

Fortiborus major (Stebbing): Hulcr and Cognato 2010a: 17.

Xyleborus siclus Schedl, 1936d: 26. Synonymy: Hulcr and Cognato 2010a: 18.

Type material.

Holotype Phloeosinus major (FRI). Allotype Xyleborus siclus (NHMUK).

New records.

India: Andaman Islands, N. Andaman, 3.xi.1930, C.F.C. Beeson, Dipterocarpus turbinatus (NMNH, 1). [West] Bengal, Chilapata forest, Buxa, 1.ix.1915, C.F.C. Beeson, Shorea robusta bark (NMNH, 1).

Diagnosis.

5.2-6.0 mm long (mean = 5.58 mm; n = 5); 2.52-2.71 × as long as wide. This species is distinguished by the moderate size; conspicuously angulate elytral apex; posterolateral declivital costa conspicuously elevated and asperate, making the declivity appear very broad and flat; declivital interstrial granules uniformly sized, present from base to apex; and discal interstrial punctures confused.

Similar species.

Fortiborus macropterus .

Distribution.

‘Borneo’, India (Andaman Is*, Assam, West Bengal*), Indonesia (Mentawai Is, Sumatra), New Guinea, Thailand.

Host plants.

This species is also closely associated with Dipterocarpaceae ( Browne 1961b). There are records of single specimens taken from three other families ( Ohno 1990), but they may not have been breeding.

Figures

Figure 60. Dorsal, lateral and declivital view of Fortiborus macropterus lectotype, 4.8 - 5.1 mm (A, B, G), F. major, 5.2 - 6.0 mm (C, D, H), and F. pseudopilifer, 6.6 mm (E, F, I).