Hylastes


Type species

Bostrichus ater Paykull

Adapted from Wood 1982, p. 93-107


Diagnosis

Hylastes is very similar to Hylurgops LeConte from which it is separated by having equally sized punctures on the pronotum and usually shorter vestiture on the declivity. Additionally, the pronotum is usually not constricted anteriorly as in Hylurgops.


Description

Species in this genus range from 2.1 to 6.0 mm in length and are approximately 2.6 to 3.2 times as long as wide. Their color varies from reddish brown to black. The pronotum is longer than wide and unarmed. The scutellum is small. The declivity is convex and has granules or rarely small tubercles. The vestiture usually consists of short hair-like setae. The frons usually has a median carina or a median groove above the epistoma. The scape is usually as long as the 7-segmented funicle. The club is ovate with three straight sutures. The procoxae are contiguous.


Distribution

The Holarctic realm with intrusions into the Neotropics south to Honduras.


World fauna

Number of species: 31, Native species: 13, Introduced species: 1


Established exotic species

Hylastes opacus is present in Maine, New Hampshire, Vermont, New York, West Virginia, and Oregon.


Hosts

Abies, Larix, Picea, Pinus, Pseudotstuga, Tsuga