Corthylus


Type species

Bostrichus compressicornis Fabricius

Adapted from Wood 1982, p. 1270-1310


Diagnosis

Species in the genus Corthylus can be distinguished from other members of the subtribe Corthylina by the single segmented antennal funicle, the clubbed-shaped and asymmetrical club, and also by the subtriangular scape.


Description

Species in this genus range from 1.2 to 4.3 mm in length and are approximately 2.0 to 2.5 times as long as wide. Their color ranges from yellowish brown to black, and several species out of the region are bicolored. The pronotum appears as long as wide, although it is actually either slightly wider or longer; its anterior margin usually has serrations in females, or one pair of median serrations in males. The scutellum is large and flush with the elytra surface. The declivity varies from convex to concave. The vestiture consists of hair-like setae, usually on the declivity. The metepisternum is only visible anteriorly. In females, the frons can be elaborately ornamented by a long tuft of hair not present in species north of Mexico. The anterior margin of the compound eye is emarginate. The scape is longer than the single segmented funicle. The clubbed to oval-shaped club is sexually dimorphic but in both sexes is large and asymmetrical with one to three procurved sutures usually present, the first usually septate. In some females, there is thin stalk of long setae called the cirrus on the lateral margin of the posterior face of the club (only present in C. spinifer in North America north of Mexico). The procoxae are contiguous.


Distribution

Canada to Argentina


World fauna

Number of species: 117 Native species: 4, Introduced species: 0


Hosts

Acer, Alnus, Castanea, Cecropia, Clusia, Conostegia, Ficus, Liriodendron, Miconia, Myrica, Ochroma, Persea, Phoebe, Platanus, Quercus, Salix, Solanum, Spondias, Theobroma, Ulmus