Arixyleborus Hopkins, 1915

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

Arixyleborus Hopkins, 1915

Arixyleborus Hopkins, 1915a: 59.

Xyleboricus Eggers, 1923: 212. Synonymy: Schedl 1952d: 162.

Type species.

Arixyleborus rugosipes Hopkins, 1915a; original designation.

Diagnosis.

1.35-5.2 mm, 2.0-3.5 × as long as wide. Arixyleborus is distinguished by the elytra with distinctive deep strial furrows and interstrial ridges, ridges either granulate or carinate (three species without). Arixyleborus can be further diagnosed by the obliquely truncate antennal club with segment 1 almost covering the posterior face (type 2), club wider than long or as long as wide; protibiae slender or evenly rounded, posterior face flat and unarmed or inflated and granulate; scutellum variable either flush with elytra and flat, flush with elytra and medially impressed or flat and depressed below elytra; elytra from dorsal view typically angulate apically, rarely rounded; mycangial tufts absent; and procoxae contiguous.

Arixyleborus is similar to Stictodex with which it shares a broad antennal club but which lacks the distinctive elytral ridges and furrows. In addition, Arixyleborus has declivital striae 1 parallel to the suture while in Stictodex they are not parallel but undulating.

Similar genera.

Cnestus , Pseudowebbia , Stictodex , Truncaudum , Webbia .

Distribution.

Distributed throughout tropical Asia and Oceania.

Gallery system.

An unbranched radial or curved entrance tunnel, sometimes with a few branches. As the larvae develop, their feeding activity extends part of the main gallery into a single longitudinal brood chamber usually approximately rectangular in shape, and the width of the main gallery ( Browne 1961b).