Black, covered with slaty-black scales. Beak shorter than the prothorax, rather stout, scarcely curved, flattened above and finely tricarinate, lateral grooves deep; front deeply excavated between the eyes. Prothorax longer than wide, gradually slightly narrowed in front, constricted near the tip, sides not rounded; undulated by deep, distant anastomosing grooves, of which the most conspicuous forms a dorsal channel; surface not coarsely granulated. Elytra nearly one-half wider than the prothorax, humeri oblique, scarcely rounded, sides converging behind, tip more elongated and more narrowly rounded than in the next species; posterior callus prominent, striae punctured; interspaces broad, slightly uneven, each with a row of very short whitish bristles; each side just behind the middle is a small oblique spot of white scales, extending from the fifth to the second stria. Antennae and legs nearly black; tibiae long, much curved; tarsi short, slender.

Length 4.3 mm.; 0.17 inch.

Enterprize, Florida; May; one specimen; Messrs. Schwarz and Hubbard. Closely related to the next (B. magister), but differs by the deeply excavated front, and elytra more narrowly rounded at tip.