Very closely allied to and much resembling A. ventralis Moser ¹) from Tonkin and of the same length (9.5—10 mm.) but proportionately broader and less parallel. Both species have the base of the abdomen (the two basal ventral segments) and the apex of the elytra dull black, the anterior tibiae tridentate and the sides of the abdomen not sharply margined. The new species is distinguished from ventralis: 1° by the broader and less parallel shape of the body; 2° by the punctuation of the pronotum, the punctures being somewhat larger and slightly more distant from one another; 3° by the space between the humeral costa and the first of the two lateral interstices, which space is broader behind the shoulders than it is in ventralis; 4° by the more conspicuous very minute erect white setae, visible with the aid of a strong lens, in the punctures on the elytra of basiventris, which setae are almost imperceptible in ventralis.