NATURAL SCIENCES OF PHILADELPHIA. 363 



4. Prothorax gradually narrowed from the base, broadly rounded on the 

 sides, more strongly towards the lip, coarsely punctured, the punctures more 

 distant than the length of their diameters ; (elytral intervals and striae as in 

 B. striatus; resembles B. carinulatus, but the prothorax is distinctly 

 impressed on the sides near the tips,) Long. 6 mm. Kansas and Wiscon- 

 sin 12. strenuus. 



Resembles the preceding in form and sculpture, but the punctures of the 

 prothorax are larger and more distinctly umbilicated, and the sides more 

 deeply constricted near the tip. Long. 5 mm. Penna., one specimen ; 

 Mr. Rathvon 13. umbilicatus. 



Somewhat narrower and more regularly oval, prothorax gradually but more 

 strongly narrowed from the base, and more obliquely rounded near the tip, 

 less coarsely but somewhat more densely punctured than in B. strenuus; 

 elytra with the intervals wider than the stria;, with rather confused rows of 

 fine but well marked punctures. Long. 6 mm. Wisconsin, 1 specimen. 



14. s ub o V a 1 i s. 



5. Punctures of prothorax more distant than their diameter, sides scarcely 

 narrowed from the base, more broadly rounded near the tip, dorsal line 

 wide; elytral intervals wider than the striae with rows of distant large 

 shallow punctures. Body less convex than usual. Long. 3-5 mm. New 

 Mexico, 1 specimen 15. d i s t a n s. 



Prothorax more densely punctured, sides slightly narrowed from the base, 

 more obliquely rounded near the tip and more distinctly constricted ; elytra 

 as in the preceding, but with a small white pubescent basal spot each side, 

 and a few scattered white scale-like hairs. Long. 3 — 4 mm. Southern 

 States, 3 specimens 16. nigrinus Say. 



6. Body oval or elongate. 7. 

 Body broadly ovate, black shining, prothorax wider than long, strongly 



but not densely punctured, with very feeble dorsal carina, sides narrowed 

 from the base, strongly rounded in front, and deeply constricted near the tip; 

 elytral intervals wider than the strise, with rows of small but deep punctures. 

 Long. 2-5 — 3 mm. Middle States, 4 specimens 17. ovatus. 



7. Bod}' oval, black shining, j)rothorax not wider than long, strongly and 

 densely punctured, without dorsal carina, sides narrowed and broadly 

 rounded from the base, slightly constricted near the tip ; elytral intervals 

 broad, with rows of very fine but well marked punctures. Long. 2-5 mm. 

 Middle States, 2 specimens 18. p u s i 1 1 u s. 



Body elongate oval, black, less shining, prothorax longer than wide, more 

 coarsely punctured, punctures less distant than the length of their diameters, 

 without dorsal carina, sides converging from the base, rounded only near the 

 apex, which is feebly constricted ; elytral intervals a little wider than the striae, 

 with rows of well marked punctures, disc feebly impressed obliquely each 

 side behind the shoulder. (Of the same form as B. m a c e r, but otherwise 

 quite distinct. It differs remarkably from all the others of this division by 

 the 2d joint of the funiculus of the antennae being somewhat longer than the 

 3d, though much less conspicuously than in the species of division B.) Long. 

 3 — 3-5. Illinois and Kansas. 5 specimens 19. a n g u s t u s. 



Also slender in form, black, not very shining, prothorax punctured as in 

 the preceding, with the sides not converging from the base, but parallel, and 

 more strongly rounded in front, tip feeblj' constricted ; elytral intervals wider 

 than the striae, with rows of well marked punctures. (Resembles B. m a c e r, 

 but the thorax is more full in form, more densely punctured, and is feebly con- 

 stricted at the tip ; the beak is also longer and more slender.) Long. 2-5 mm. 

 California, 1 specimen. San Francisco 20. s e r i a t u s //ec. 



Somewhat less slender, bronzed black, shining, prothorax scarcely larger 

 than wide, narrowed from the base and feebly rounded on the sides except 



1868.] 



