Length about 33 ram. — The whole insect, with the exception, however, of the 2nd and succeeding abdominal segments, shows, under certain lights, a beautiful golden lustre, owing to a fine golden pubescence which is longer and more erect on the prothorax; on the first ventral segment this pubescence is, in places, silvery, on the 2nd and following segments it is black. The head with palpi and antennae, the legs, the wingcases and the wings are ochreous; the head with an impressed, mesial, dark line, which extends from the centre of the face up to the prothorax; the throat, a spot behind each eye, and the tip of the mandibles black, the antennae slightly infuscate towards the end.