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Thickset scolytid borer

Scientific Name
Cnestus solidus
Scientific Author
(Eichhoff, 1868)
(Coleoptera: Curculionidae: Scolytinae: Xyleborini)
Native Australian Pest Species
Native Australian Pest Species

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Diagnostic Images

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Diagnostic Images (8)
Diagnostic Notes
Diagnosis: Cnestus can be distinguished from Xylosandrus by the subcontiguous procoxae and by the more broad declivity which covers most of the elytra. The elytra are only slightly longer than the pronotum.

Description: The body size ranges from 2.6 to 3.9 mm in length and is approximately 1.7 times as long as wide. Its colour is black. The pronotum is clearly wider than long with the anterior margin armed. It presents a thick tuft of setae just anterior of the pronotum, over its mycangia. The scutellum is large, and flushed with the elytra. The declivity is unarmed and proportionally very large and convex, starting at approximately the second third of the elytra; the ventrolateral margin is raised in a line from the apex to interstriae seven. The vestiture consists of erect and hair-like setae. The anterior margin of the compound eye is emarginate. The scape is longer than the 4-segmented funicle, but it can appear as 5-segmented. The club is obliquely truncate with the basal area recurved, and the suture are not evident. The procoxae are widely separated.

Cnestus solidus:

Body length 4.3mm; colour red-brown with elytra darher than pronotum; in side view elytra markedly truncated posteriorly, lateral truncation clearly carinate.

Xylosandrus spp. are distinguished from related genera (Xyleborus, Xyleborinus, Ambrosiodmus) by the stout body, truncate elytral declivity, and non-contiguous procoxae.

Cnestus solidus (Eichhoff, 1868; Xyleborus) [comb. nov. Dole & Beaver (2008: 490)]