AMERICAN COLEOPTERA. 223 



Group 3. — semlferrug ineus. 

 In the species of this group, which is the best represented in our 

 fauna, the side margin of the prothorax is acute and the flanks con- 

 cave ; the fissure of the front coxal cavities is short and closed ; the 

 prosteriKil sutures run from the outer end of the fissure towards the 

 anterior angles of the pronotuni, so that the side pieces (episterna) are 

 distinctly triangular. The mandibles are stout, strongly toothed near 

 the tip, which is compressed and gradually narrowed. The rows of 

 spines on the front tibise are widely separated ; the hind tibiae are 

 long and slender, fimbriate with long sparse hairs and a few fine 

 spines. 



Prothoracic episterna verj' distinctly triangular, sutures directed to the front 



angles of the pronotuin 2. 



Prothoracic episterna not triangular, sutures parallel with the side margin of 



the under surface of the prothorax 6. 



2. — Sides of prothorax very much rounded 3. 



Si<les of prothorax slightly rounded, nearly jiarallel in front 5. 



3. — Head not or obsoletely punctured 4. 



Head coarsely punctured 13. scniircrriigiiicus. 



4. — Prothorax wider than long, densely punctured. ..14. rotliiidicollis, n. sp. 



Prothorax not wider than long, more coarsely punctured 15. fiiiiiatU!!). 



5. — Larger, head shining, sparsely punctured 16. iiitadieop!^, n. sp. 



Smaller, head opake, impunctured 17. opaci Irons, n. sp. 



Testaceous, doisal line of prothorax deep 18. riil>ij;iiiO!<iii!«. 



6. — Ferruginous, head and prothorax darker, tip of abdomen black,- dorsal line 



of prothorax faint 19. unali$«. 



Blackish-brown, elytra, antennte and legs brown; dorsal line of })n>tiiorax 

 wanting 20. iiitidicollis. 



13. B. seniil'errugi Ileus, Loc. New Sp. Col. (Smithsonian 8vo), 52. — 

 Chestnut-brown, shining, elytia paler, legs yellow-brown. Head coarsely punc- 

 tured, with a smooth space on the vertex, in the middle of which is a large 

 deep puncture. Prothorax nearly globose, truncate in front, coarsely rather 

 densely punctured, dorsal line deep. Elytra deeply and rather densely, but 

 not coarsely punctured. Dorsal segments sparsely punctulate; ventral also 

 sparsely punctulate. Side margin of prothorax fine but distinct, flanks con- 

 vex, sutures of prosternum reaching the front angles of the pronotum; epis- 

 terna smooth, triangular; prosternum opake, feebly punctured. Mandibles 

 with a large tooth near the tip; apical part rather slender. Length 4.5 mm ; 

 .18 inch. 



%. — Sixth ventral segment broadly emarginate in an arc of a circle; eighth 

 segment not incised nor impressed. J . — Sixth ventral truncate. 

 Middle States, Michigan. Florida. 



14. U. rotiiudicollis, n. sp. — Chestnut-brown, tip of abdomen and legs 

 brownish-yellow. Head opake, finely granulate, not punctured; vertex obso- 

 letely foveate. Prothorax wider than long, rounded, truncate in front, deeply 

 rather densely punctured, dorsal line distinct. Elytra densely and rather finely 

 punctured. Dorsal segments sparsely punctulate; ventral finely rather densely 



