Callidiellum rufipenne is native to eastern Asia and was discovered in live arborvitae in Connecticut in 1998. The borer has since established in the southern half of Connecticut. C. rufipenne is polyphagous on conifers but is found most frequently on plants in the families Cupressaceae and Taxodiaceae. We investigated two aspects of C. rufipenne’s chemical ecology. We confirmed that they follow the typical mating strategy of Cerambycidae; males recognize females only upon contacting females with their antennae, and this recognition is dependant on the presence of a contact pheromone in the female’s epicuticle. The contact pheromone appears to consist of a single hydrocarbon. We also discovered that male C. rufipenne produce a volatile pheromone. This pheromone is consistent in chemical structure with recently discovered aggregation pheromones produced by males of two other cerambycid beetles; the red-headed ash borer (Neoclytus acuminatus acuminatus(Fabricus)) and the red-oak borer (Enaphalodes rufulus (Haldeman)). In addition, the pores which release the volatile pheromone, and the glands which produce it were identified, and were consistent in location and structure with those of the other two cerambycids. The function of this volatile pheromone for C. rufipenne is under investigation