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Cnesinus | Bark Beetle Genera of the United States

Cnesinus


Type species

Cnesinus strigicollis LeConte

Adapted from Wood 1982, p. 208-245


Diagnosis

Species in Cnesinus can be distinguished from Pagiocerus Eichhoff by the straight sutures on the club.


Description

Species on this genus range from 1.6 to 3.5 mm and are from 2.4 to 2.8 times as long as wide. Their color ranges from reddish brown to black. The large pronotum varies from smooth to longitudinally strigose. The scutellum is small. The anterior margin of the elytra presents small crenulations. The declivity is convex, sometimes shallowly impressed at interstriae 3 in such a way that it can appear flat or slightly bisulcate, and it is usually unarmed. The frons is sexually dimorphic, concave and surrounded by upward facing setae more elaborate in males, slightly depressed to convex in females. The vestiture varies from absent to abundant, usually of hair-like setae, rarely with scales. The anterior margin of the compound eye is sinuate to emarginate, in a few species subcontiguous at the top. The scape is usually longer than the 6-segmented funicle which has long setae. The oval club has three straight sutures, though the third is absent in some species. The procoxae are separated.


Distribution

Southeastern United States, central Mexico to Argentina


World fauna

Number of species: 101, Native species: 1, Introduced species: 0


Hosts

Acacia, Annona, Arbutus, Coffea, Croton, Guazuma, Oreopanax, Quercus, Rubus, Serjania