These beetles are recognizable by their black colour and the small white spot formed by the scutellum (the triangle at the base of the elytra). They have strong, long, reddish legs. The females are larger than the males, and their elytra (wing covers) often have small white spots. Their antennae are barely longer than their bodies, whereas the males’ antennae are twice as long as their bodies. Without their antennae, the insects vary in length from 13 to 27 mm.
The legless larvae are whitish and slightly flattened, with brown heads. They can grow to more than 4 cm long.