AMERICAN COLEOPTERA. 331 



7. Scutellum round, densely clothed with white alboscutcllatus. 



Scutellum more or less elongate 8 



8. Elytral striae wide, deep and coarsely punctured at base perforatus. 



Elytra! strife moderate 



9. Vestiture of elytra uniform in disposition and color 10 



Vestiture variable in color. 



Cinereo-pubescent, obscurely maculate; intervals finely punctulate. 



pauperculus. 



Cinereo-pubescent, on the intervals interrupted ; intervals with coarse 



punctures distingucmlus % . 



10. Elytra very sparsely pubescent ealvus. 



Elytra densely clothed, surface color nearly concealed fraterciilus. 



6. Thorax sparsely punctured, comparatively smooth ; eyes flat amicus. 



Thorax densely punctured ; eyes convex.. 11 



11. Abdomen rufo- or pieeo-testaceous obsolctus. 



Abdomen and entire under surface black 12 



12. Pubescence of elytra unevenly disposed 13 



Pubescence evenly disposed, usually concealing the color of elytra 15 



13. Pubescence interrupted on the intervals by darker spaces 14 



Pubescence sparse forming sinuous designs longistilus. 



14. Thorax roughly punctured; elytral intervals with coarse punctures. 



distingnemlus 2 • 

 Thorax not roughly punctured; intervals punctulate bsbisci. 



15. Hind legs entirely black; scutellum broad with white pubescence, 



schrankise. 

 Hind legs bicolored; scutellum longer than wide. 



Pubescence of elytra cinereous somewhat yellowish, unicolored aureola*. 

 Pubescence ochreous, clouded mixtus. 



B. prosopis, Lee, Proc. Acad., 1858, p. 77. — Oblong, ferruginous, sparsely 

 cinereo-pubescent, elytra with patches of brown along the lateral margin • 

 Head brownish testaceous, coarsely punctured, sparsely cinereo-pubescent. 

 Eyes with golden lustre. Antennae as long as head and thorax, feebly sub-ser- 

 rate, pale rufous. Thorax trapezoidal, very nearly as long as wide at base, 

 sides straight, base lobed at middle and on each side slightly sinuate; surface 

 coarsely punctured, punctures distant, median line finely impressed, sparsely 

 clothed with cinereous pubescence clouded with brownish and with a narrow 

 patch of white pubescence extending half way along the median line. Scutel- 

 lum twice as long as wide, median line distinct, cinereo-pubescent. Elytra at 

 base not wider than the thorax, sides slightly arcuate and diverging toward 

 apex; surface striate, striae punctured, intervals flat, punctulate and with a 

 few coarse punctures distantly placed; color brownish testaceous, with darker 

 patches along the sides; vestiture cinereo-pubescent, interrupted with very 

 narrow transverse lines of brownish. Pygidium slightly oblique, coarsely 

 punctured, clothed with cinereous pubescence clouded with brown, and on each 

 side near the apex a dark brown, impressed line. Body beneath pale rufous 

 densely whitish pubescent. Legs pale testaceous. Length .16 inch ; 4 mm. 



The dark patches along the side of the elytra are of irregular size 

 and are usually four in number, in addition to which a space clothed 



