112 AMERICAN COLEOPTERA. 



1. Abdoiiieii coarsely closely punctate (PI. 2, fig. 12). 2. 



Abdomen much more finely sparsely punctate (PI. 2, fig. 13) 3. 



2. Size large — 2 mm. or over. 



Protliorax with base and apex subequal. 



Prothora.x longer than wide 1. erraticiim. 



Protliorax as wide as long. 



Humeri evidetit, body more parallel, less convex, legs rufous. 



2. impedituiii. 

 Humeri absent, body more ovate, more convex, legs black. 



3. qiiadrioolle. 

 Protliorax with base noticeably wider than the ajiex. 



Stouter, sides of prothorax not prominent at the middle, elytra widest 



at the middle 4. proteiisuiii. 



More slender, sides of prothorax rather ])roniiiient at the middle, elytra 



widest behind the middle 5. iinpiinctistrialuiii. 



Size small, always less than 2 mm. 



Prothorax longer than wide, densely punctate, legs black. 



B. coracelliiin. 

 Prothorax as wide as long, sparsely punctate, legs and antennse red. 



7. anceps. 



3. Prothoi'ax wider than long, sides arcuate, body robust 8. atripes. 



Prothorax longer than wide, body more slender 



Polished area of anterior femora ( % ) plainly longitudinally strigosa. 



Anterior tibiae ( % ) strongly widened apically 9. fillitiilliiui. 



Anterior tibiae ( ^ ) slightly wider in apical three-fourths- • • -10. virile. 

 Polished area of anterior femora ( % ) nor strigose or with the striae few and 

 inconspicuous. 

 Humeri moderate. 



Infra limiting ridge of anterior femora ( % ) strong. . . .11. melaiiai'ilini. 

 Infra limiting ridge feeble or absent. 



Very narrow, size small, less than 2 mm 12. flori<Iaiinin. 



More robust, size large, 2.5 mm. 13. robiisliiin. 



Humeri wanting 14. ob!$oletuin. 



4. Beak short, dilated at base and almost coiiii)letely shining beyond the dilation 



in both sexes 15. ellipliciiin. 



Beak of female not dilated at base. 

 Size small, seldom exceeding 1.5 mm. 



Legs and antennae rufous, beak ( "J, ) stouter, humeri wanting oi- but 



faintly indicated. 16. de.solatiiiii. 



Legs black, or at most rufo piceous, beak ( % ) more attenuate. 

 Humeri wanting. 

 Beak sinuate toward the base, intervals flat, abdomen nearly impunctate. 



17. siuiiiroMtriiiii. 

 Beak as usual, intervals more or less convex, abdominal punctures coarse and 



numerous 18. inolestuiii. 



Humeri distinct. 



Larger, body more ovate and more longitudinally convex, beak longer. 



19. in in III Hill. 



Smaller, body more parallel, less convex, beak shorter. 20. texaniiin. 



Size larger, seldom less than 2 mm. 21. pennsylvaniciini. 



