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Polygraphus | Bark Beetle Genera of the United States

Polygraphus


Type species

Hylesinus pubescens Fabricius

Adapted from Wood 1982, p. 386-391


Diagnosis

Polygraphus can be distinguished from Carphoborus Eichhoff by the completely divided eye and a club without sutures.


Description

Species in this genus range from 1.8 to 3.1 mm and are approximately 2.0 to 2.4 times as long as wide. The color is black. The pronotum is wider than long and unarmed. The scutellum is not visible. The declivity is convex, bearing granules. The vestiture consists of abundant, short and light colored scales. The eye is divided in two parts. The scape is usually longer than the 5- to 6-segmented funicle. The ovate club is flat and without sutures, finely pubescent, and often ending in a pointed tip. The procoxae are contiguous.


Distribution

Alaska, Canada, and the northern and mountainous parts of the United States where spruce forests grow; Europe, Asia, and Africa


World fauna

Number of species: 96, Native species: 3, Introduced species: 0


Hosts

Abies, Picea, Pinus