Cnestus improcerus (Sampson, 1921) Fig. 33A, B, I

Xyleborus improcerus Sampson, 1921: 33.

Xylosandrus improcerus (Sampson): Beaver 1998: 183.

Cnestus improcerus (Sampson): Dole and Cognato 2010: 529.

Type material.

Holotype (NHMUK).

Diagnosis.

2.7-3.3 mm long (mean = 3.04 mm; n = 5); 1.67-1.74 × as long as wide. This species is distinguished by the presence of a mesonotal mycangial tuft on the pronotal base; elytral disc very short; procoxae widely separated; declivity bicolored, with the basal 1/2 black and the apical 1/2 with a pale translucent area; declivity flat; pronotum type 1 when viewed dorsally; antennal club type 2, with two sutures visible on posterior face; antennal funicle 4-segmented; protibiae distinctly triangular; declivital posterolateral margin moderately carinate from apex to declivital base along interstriae 7; declivital interstriae punctate, setose, and ground vestiture absent.

Similar species.

Cnestus ater, C. gravidus, C. mutilatus, C. testudo, Xylosandrus spp.

Distribution.

‘Borneo’, Brunei, East & West Malaysia, Thailand.

Host plants.

Recorded from Canarium ( Burseraceae), Dipterocarpus ( Dipterocarpaceae), and an unidentified genus of Lauraceae (Browne 1961b).

Remarks.

Reported by Wood and Bright (1992) as occurring in India but no actual records have been found.