Genus Dichelonycha Harris.–Labrum transverse, lanceolate, scarcely emarginate. Mandibles short, trigonal, incurved, toothless, acute : molary space transverse, furrowed. Maxillæ minute, linear, bidentate, with short teeth. Labium subquadrangular, not distinct from the mentum. Palpi maxillary four-jointed ; first joint very minute ; second longer than the third, obconical; third trianguler; last joint as long as the three others together, very large, subsecuriforrn. Palpi labial three-jointed; joints short, subfiliform ; last truncated.