It is a large insect, 15-38 mm long, elongated, gray-blue, with black spots on the sheaths and long antennae, which can exceed the length of the body and reach 50-55 mm. The life cycle lasts 2-3 years, the female lays eggs in spring in the bark of the trees. Larvae grow in the trunk. They prefer beech, but also grow in willow, hornbeam, oak, holm, even apple. Adults are active during sunny days, but can also appear in the twilight.
They prefer dry and sunny old forests (with trunk diameter over 20 cm).