The Prioninae are a subfamily of Cerambycidae (long-horned beetles). They are typically large (25–70 mm) and usually brown or black. The males of a few genera sport large mandibles that are used in fights with other males, similar to stag beetles.
These beetles are commonly nocturnal and are attracted to light. The majority of the Prioninae whose biology is known are borers whose larvae feed on rotting wood or roots.