Longhorned beetles (Coleoptera: Cerambycidae) are hyper-diverse and economically important herbivores. This multifaceted identification tool covers potentially invasive genera that have been intercepted multiple times in the USA from all major world regions. It is also comprehensive for conifer-feeding genera of the Cerambycinae, Lamiinae, and Spondylidinae in the Northern Hemisphere. In addition, all Monochamus sensu stricto species are treated. We provide Lucid keys, fact sheets, and a searchable image gallery.