Robust ovate, very convex, almost gibbous, black, shining (sparsely squamose, with linear white scales, which have been mostly removed by abrasion). Beak sparsely punctured, feebly transversely impressed at base; head convex, sparsely punctulate in front, smooth behind. Prothorax twice as wide as long, very convex, strongly narrowed in front, sides obliquely narrowed, very strongly constricted about one-fourth from the apex, which is half the width of the base; the latter is not truncate, but very broadly rounded; surface feebly and sparsely punctulate, lateral edge nearly acutely defined. Elytra not narrower than the prothorax at base, basal angles not rounded, sides gradually narrowed and slightly rounded to the tip; striae fine, feebly punctured, ending near the base in deep foveae; interspaces broad, flat, smooth. Antennae with the first joint of funicle scarcely longer than the second, but somewhat stouter than in the other two species.

Length 2.2mm.; 0.09 inch.