Xyleborinus subspinosus (Eggers, 1930) stat. res.

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

Xyleborinus subspinosus (Eggers, 1930) stat. res. Fig. 86E, F, K

Xyleborus subspinosus Eggers, 1930: 203.

Xyleborinus subspinosus (Eggers): Saha and Maiti 1987: 73.

Type material.

Holotype (FRI).

Diagnosis.

2.3 mm long ( Eggers 1930). This species is distinguished from other Southeast Asian species by the unique sculpturing of the declivity with interstriae 1 unarmed and interstriae 2 and 3 denticulate along their lengths.

Similar species.

Xyleborinus attenuatus , X. saxesenii , X. subgranulatus , X. thaiphami .

Distribution.

India (Assam).

Host plants.

Unknown.

Remarks.

Wood (1989) placed X. subspinosus in synonymy with X. saxesenii without comment. The declivity of the two species are obviously different with that of X. subspinosus having declivital interstriae 1 unarmed except at base, and interstriae 2 denticulate throughout its length. In X. saxesenii , declivital interstriae 1 is denticulate throughout its length and interstriae 2 unarmed except at base. Xyleborinus subspinosus is here removed from synonymy with X. saxesenii due to clearly evident declivital differences.

Figures

Figure 86. Dorsal, lateral and declivital view of Xyleborinus spinipennis, 2.3 - 2.75 mm (A, B, I), X. subgranulatus, 1.6 - 1.8 mm (C, D, J), X. subspinosus holotype, 2.3 mm (E, F, K), and X. thaiphami holotype, 2.8 - 2.9 mm (G, H, L).