Adults are reddish brown to black; the body is distinctly flattened.
Development. Eggs are laid in cracks on the wood surface; hatching occurs in 14 days. Larval development is eight to 10 months. Full-grown larvae bore close to the wood surface and form a pupal chamber. Development from egg to adult is one year, but can extend to two to four years. Adults emerge from May to September.
Habits. Larvae survive  wood  moisture content between 8% and 30%; larval development is optimum at 16% moisture content.