Xyloterinus

Type species

Bostrichus politus Say

Adapted from Wood 1982, p. 745-746

Diagnosis

Xyloterinus is distinguished from other genera with a divided eye by the broad and slightly procurvedprocurved:
pertaining to structure (antennae, setae) which is basally perpendicular to the body and whose apical part is curved anteriorly
basalbasal:
situated at the base or inner edge and proximal to the main body
area of the clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
. They are distinguished from Polygraphus Erichson, which are usually black, and Trypondendron Stephens, which usually have light and dark lines on the elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
, by their uniform brown coloration.

Description

This monotypic genus ranges from 3.3 to 3.7 mm in length and is approximately 2.7 times as long as wide. Its color is a uniform brown. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is basically as long as wide and armedarmed:
having a sclerotized surface structure, giving a rough texture; may serve as defense
on the anterior half by asperitiesasperities:
pertaining to surface roughenings or dot-like elevations that are not pointed
and two denticles on the center of the anterior margin. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is small. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
is convex and slightly flattened with a vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consisting of long hair-like setaehair-like setae:
setae that are thin and similar to a hair
, which is shorter on the elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
. The eye is completely divided in two parts. The scapescape:
the first and basal segment of the insect's antennae
is longer than its 4-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
. The clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
is unmarked by suturessutures:
a seam or seam-like line of contact between two sclerites or hardened body parts immovably connected
and is near-circular, with its basalbasal:
situated at the base or inner edge and proximal to the main body
area broad and slightly procurvedprocurved:
pertaining to structure (antennae, setae) which is basally perpendicular to the body and whose apical part is curved anteriorly
, and the rest covered by a short pubescence. The procoxaeprocoxae:
extra segment occasionally preceding coxa (hip joint) of the first or anterior pair of legs of arthropods
are contiguouscontiguous:
sharing an edge or boundary; touching
.

Distribution

Eastern Canada and the USA

World fauna

Number of species: 1, Native species: 1, Introduced species: 0

Hosts

Acer, Alnus, Betula, Carya, Castanea, Fagus, Fraxinus, Quercus, Picea, Pinus, Tsuga, and Ulmus