Scolytus


Type species

Bostrichus scolytus Fabricius

Adapted from Wood 1982, p. 419-450


Diagnosis

The most distinctive character used to distinguish Scolytus from the similar genus Cnemonyx Eichhoff is the absence of a declivity, which is reduced in Cnemonyx.


Description

Species in this genus range from 1.5 mm to approximately 5.2 mm in length and have a body size ratio of 2.0 to 2.4 times long as wide. Their color varies from dark reddish brown to almost black and shows transverse bands in some species. The pronotum is proportionally large in relation to its body and has the margins marked by a raised line; it usually appears as long as wide but it actually varies slightly. The scutellum is large. There is no declivity and the abdomen can be seen ascending towards its apex. The anterior margin of the compound eye is sinuate to slightly emarginate. The scape is shorter than the 7-segmented funicle. The club is oval to obovate, usually pubescent, and can have one procurved suture at most. Their procoxae are subcontiguous. The tibia has a single apical spine.


Distribution

Most of the Northern Hemisphere and South America


World fauna

Species number: 120, Native species: 16, Introduced species: 4


Established exotic species

Scolytus mali is present in New York, New Jersey, Maryland, and Ohio.

Scolytus multistratus and Scolytus rugulosus are present in the entire continental United States and Alaska.

Scolytus schevyrewi is present in California, Oregon, Idaho, Utah, Nevada, Arizona, Montana, Wyoming, Colorado, New Mexico, Oklahoma, Kansas, Nebraska, South Dakota, Minnesota, Missouri, Illinois, Michigan, Indiana, Maryland, and New Jersey.


Hosts

Abies, Carya, Celtis, Cydonia, Crataegus, Fagus, Inga, Larix, Malus, Picea, Prunus, Pseudotsuga, Pyrus, Ulmus, Tsuga