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Xyleborinus | Bark Beetle Genera of the United States

Xyleborinus


Type species

Bostrichus saxeseni Ratzeburg

Adapted from Wood 1982, p. 841-848


Diagnosis

Xyleborinus is distinguished from Xyleborus Eichhoff by the conical scutellum that does not fit into the sutural notch and is surrounded by a conspicuous pubescence.


Description

The length of females in this genus ranges from 1.4 to 3.5 mm, and they are 2.6 to 3.0 times as long as wide. The males are dwarfed and flightless. Their color is dark brown. The pronotum is usually longer than wide. The scutellum is conical, does not fit in the scutellar notch, and is surrounded by distinctive short tuft of hairs. The declivity can either be concave, flat, or convex and is armed by a varying number of interstrial tubercles or rarely spines. The anterior margin of the compound eye is emarginate. The scape length in proportion to the funicle is variable and is 5-segmented. The club is obliquely truncate with none to two recurved sutures on its posterior face. They have a depressed pregular region. The procoxae are contiguous, if apparently narrowly separated, the intercoxal piece conspicuously notched longitudinally.


Distribution

Worldwide


World fauna

Number of species: 79, Native species: 2, Introduced species: 2


Established exotic species

Xyleborinus alni is present in Maine, New York, Pennsylvania, Maryland, Washington, and Oregon.

Xyleborinus saxeseni is present in Maine, New Hampshire, Massachusetts, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, West Virginia, North Carolina, South Carolina, Georgia, Florida, Ohio, Indiana, Kentucky, Tennesee, Alabama, Mississippi, Michigan, Illinois, Louisiana, Arkansas, Missouri, Iowa, Kansas, Texas, Utah, Arizona, California, Oregon, and Washington.


Hosts

Eugenia, Ochroma, Theobroma, Terminalia