Taxonomy

Xyleborus Eichhoff, 1864: 37.

Synonyms

Anaeretus Dugès, 1888: 141. Hagedorn, 1910b: 98.

Progenius Blandford, 1896a: 20. Hagedorn, 1910b: 98.

Mesoscolytus Broun, 1904: 125. Beaver, 1998: 181.

Boroxylon Hopkins, 1915a: 58. Schedl, 1952c: 162.

Diagnosis

 1.9−3.9 mm long, 2.5−3.51 times as long as wide. Xyleborus is distinguished by a combination of homoplastic characters which include the scutellum flush with elytra and flat; mycangial tufts are absent; lateral margin of pronotum obliquely costate; procoxae contiguous; pronotum from dorsal view rounded frontally (types 0, 2, 6, 7), rarely quadrate (type 4 in X. bidentatus); elytral disc longer than declivity; elytral disc strial and interstrial punctures seriate; pronotal disc alutaceous; posterior face of the protibia flat and unarmed; antennal club typically obliquely truncate with segment 1 nearly covering the entire posterior face (type 2), or flattened (type 3); antennal funicle 4-segmented; and anterior margin of pronotum typically unarmed (serrations on a carina in X. bidentatus).

 

May be confused with

Cryptoxyleborus, Fortiborus, Heteroborips, Planiculus, and Stictodex

Distribution

widespread throughout temperate and tropical regions of the world

Gallery system

The gallery system usually consists of irregularly branched tunnels, usually in one horizontal plane, but sometimes spreading into three dimensions, and without brood chambers. However, given the heterogeneity of the genus, it is not surprising that there are variations on this pattern. In some species, small brood chambers may be present. 

Remarks

Xyleborus is the largest genus and is in need of revision. Most Xyleborini species were originally described in Xyleborus, and revision of Xyleborus is ongoing on a regional basis.