Xylechinus


Type species

Hylesinus pilosus Ratzeburg

Adapted from Wood 1982, p. 143-149


Diagnosis

Xylechinus is unique among the Tomicina in having a slightly emarginate or sinuate anterior margin of the eye. In the subtribe, they share the 5-segmented funicle only with Dendroctonus Erichson. They have a similar vestiture to Hylorgupinus Swaine but can be distinguished by the number of funicle segments.


Description

Species in this genus range from 1.5 to 3.5 mm in length and are approximately 2.0 to 2.4 times as long as wide. Their color ranges from brown to dark brown in species north of Mexico, but it is usually variegated due to light and dark colored scale-like setae vestiture in the Neotropical species. The pronotum is usually wider than long, with a few species having it longer than wide, and it is unarmed. The scutellum is small. The declivity is convex, with small granules and a vestiture of small scale-like setae and sparse long, light, semi-erect, thick bristles. Their frons usually has a median carina above the epistoma. The anterior margin of the compound eye is sinuate to slightly emarginate. The scape is nearly as long as the 5-segmented funicle. The club is ovate and has three straight sutures. The prothoracic precoxal ridge is either present or absent. The procoxae are contiguous.


Distribution

Worldwide


World fauna

Number of species: 36, Native species: 2, Introduced species: 0


Hosts

Picea, Oreopanax