Dryocoetes

Type species

Bostrichus autographus Ratzeburg

Adapted from Wood 1982, p. 723-731

Diagnosis

Species in the genus Dryocoetes can be recognized from the similar Coccotrypes Eichhoff by their broad oral region and their ruguloserugulose:
minutely rugose or wrinkled
and never convergentlyconvergently:
structures coming together at an extreme or apex
aciculateaciculate:
sketched lines which appear to have been scratched with a fine needle
frons. They can also be differentiated by their hosts and their more northern distribution (with the exception of D. betulae which occurs in Florida).

Description

Species in this genus range from 1.7 to 4.4 mm in length and are approximately 2.3 to 2.6 times as long as wide. Their color is a dark reddish brown. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is usually longer than wide, with the anterior area asperateasperate:
of a surface or texture which is rough
. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is small. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
ranges from convex to flat and has granulesgranules:
a small grain-like elevation
. The vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consists of long and erect hair-like setaehair-like setae:
setae that are thin and similar to a hair
. The fronsfrons:
the upper anterior portion of the head capsule
vestiture consists of a dense brush of hair-like setaehair-like setae:
setae that are thin and similar to a hair
in females of some species and its surface is ruguloserugulose:
minutely rugose or wrinkled
. The oral region is particularly broad. The anterior margin of the compound eye is emarginateemarginate:
notched or indented
. The scapescape:
the first and basal segment of the insect's antennae
is longer than the 5-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
. The clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
is obliquely truncateobliquely truncate:
pertaining to a structure abruptly and concavely cut
with one to two recurvedrecurved:
bent backward or downward as a smiley face
sutures on the posterior faceposterior face:
the side not visible when the club is elevated against the head or visible when the club is down and sensing a surface; it usually has no sutures
. The procoxaeprocoxae:
extra segment occasionally preceding coxa (hip joint) of the first or anterior pair of legs of arthropods
are contiguouscontiguous:
sharing an edge or boundary; touching
.

Distribution

North America, Asia, Europe, and Africa

World fauna

Number of species: 42, Native species: 7, Introduced species: 0

Hosts

Abies, Betula, Fagus, Liquidambar, Picea, Pinus, Pseudotsuga, Tsuga