Length 36—40 mm. — Black, with steel-blue elytra; body and legs covered with a grey pubescence, which is interrupted on the elytra so as to form four transverse regular bands; moreover the space between the eyes and mandibles, the hinder portion of the pronotum and the shoulders and extreme base of the elytra are naked; the antennae ringed with a grey pubescence on the base of the 3rd and following joints. The head and the prothorax very sparingly punctured, the former provided with a smooth line extending from the anterior margin of the clypeus up to the prothorax, the latter with three transverse grooves, one anteriorly, the two others near the base and preceded by a postmedian rather indistinct tubercle. The lateral thoracical spines straight, strong and acute. The scutellum broadly rounded at the apex.