Hylastinus


Type species

Ips obscurus Marsham

Adapted from Wood 1982, p. 108-110


Diagnosis

In general, North American Hylesinina are similar to Scierus LeConte in the Hylastina, but their procoxae are less widely separated than in that genus. Among them, they can be easily distinguished by characters of the anterior margin of the eye which is entire in Hylastinus Bedel, sinuate in Hylesinus Fabricius, and emarginate in Alniphagus Swaine. Hylastinus’ anterior margin crenulations form a single row of small teeth.


Description

Species in this genus range between 2.0 to 2.5 mm and are approximately 2.2 times as long as wide. Their color is usually dark brown. The pronotum of the single species occurring in the USA is wider than long. The scutellum is small and depressed. The anterior margin of the elytra is armed by a single row of crenulations extending to striae nine. The declivity is convex, usually bears granules, and has a hair-like vestiture. The anterior margin of the compound eye is entire. The scape is usually as long as the 7-segmented funicle. The ovate club has three straight sutures. The prothoracic intercoxal piece is wide and margined on the side in front of the coxae by a long, elevated ridge that extends from the subcontiguous coxae to the anterior margin.


Distribution

Four European species are known, one of which has been introduced into North America


World fauna

Number of species: 4, Native species: 0, Introduced species: 1


Established exotic species

Hylastinus obscurus is present in Vermont, Massachusetts, Connecticut, New York, New Jersey, Pennsylvania, Maryland, Virginia, Indiana, Michigan, Wisconsin, Montana, Idaho, Washington, Oregon, Utah, and California.


Hosts

Lathynts, Medicago, Melilotus, Trifolium, Vicia