While studying some material sent to me from the southern part of Caliicrnia, there came to my notice this very small species of bark beetle, which interested me greatly. While it is not of much economic importance, as are other members of the subfamily Hylesininae, it is of interest because of its host relationship to Chaetophloeus hystrix (Lec.). Both occur on Rhus integrifolia.

This is a new species and a description of the same follows.