Xyleborinus Reitter, 1913

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 Reitter, 1913

Xyleborinus Reitter, 1913: 83.

Type species.

Bostrichus saxesenii Ratzeburg, 1837; subsequent designation: Swaine, 1918: 50.

Diagnosis.

Typically small (1.6-3.1 mm) and elongate (2.3-3.4 × as long as wide). Xyleborinus is most readily distinguished by the unique scutellum and elytral mycangia: scutellum minute, conical, disconnected from elytra and mycangium which opens adjacent to scutellum. In addition, the antennal club is obliquely truncate with segment 1 corneous and dominant on both sides of the club (type 1), protibiae obliquely triangular, and procoxae contiguous.

Southeast Asian Heteroborips species have elytral mycangium opening adjacent to the scutellum but the scutellum is never minute, conical and disconnected from the elytra.

Similar genera.

Cryptoxyleborus , Heteroborips , Microperus , Xyleborus .

Distribution.

Widespread throughout temperate and tropical regions of the world.

Gallery system.

In many species, a short unbranched entrance tunnel leads to a brood chamber in the longitudinal plane; in others, such as X. artestriatus , the tunnel branches and there are several small brood chambers ( Browne 1961b; Schedl 1963a). The brood chamber is enlarged by the larvae as they develop.