Corthylus

Species within Corthylus can be distinguished by the apparently absent antennal funicle (only 1 segment), the asymmetrical antennal club, and the raised line on the lateral margins of the pronotum. The pronotal disc is smooth, shining, paler than the anterior slope, with widely spaced, shallow punctures, some subtending short, semi-recumbent setae. The anterior margin of the pronotum is truncate, with a raised, undulate margin (asperities confluent) and a row of low asperities, the middle pair larger. The frons surface is finely punctate-granulate, without vestiture in the center. A yellow, waxy oval is present adjacent to the epistomal margin to the lower level of the eyes, slightly indented on the posterior margin. Both first and second antennal sutures are marked by external grooves, the first partially septate. All interstrial setae on the declivity are narrow, apically pointed, spaced within rows by distance less than their lengths. Short, erect setae are present on the lateral margins of the concavity from the upper level of the eyes to vertex.

Literature