10 J- 1^- LECONTE, M. D. 



Third joint of antennse shorter than the fourth. 



Pubescence brownish, antennse brown ; 6-8 mm. Middle and N. E. States 



Canada to British Columbia 18. pedalis. 



Pubescence black, antennse piceous; S-9.5 mm. Alaska to Vancouver. 



19. nigrinu»i. 

 9. — Prothorax more deeply punctured, pubescence longer ; 5-8 mm. Anticosti, 



N. H., Lake Superior. Varies with elytra of lighter tint 20. mixtus. 



Prothorax more finely punctured, pubescence shorter ; elytra red, black from 

 the middle to the tip; 5-5.5 mm. Maine to Wash. Territory..21. ptillns. 



10.— Antennse with 3d joint triangular in both sexes 11. 



Antennse with .jd joint at most feebly triangular in male 13. 



11.— Legs black - 12. 



Legs pale; elytra pale yellow, margins blackish near the tip; 3d antennal 

 joint of male smaller than 4th ; 8.5-10 mm. Canada, Georgia. 



22. iiigricollis. 

 12. — Elytra pale yellow, sutural margin and tip black: 3d antennal joint of male 



as large as 4th ; 7.5-8.5 mm. Canada, Georgia, Illinois 23. linteu$$. 



Elytra black, basal and lateral margins scarlet; 3d antennal joint of male 



smaller than 4th ; 10 mm. Canada, Georgia 24. discoideus. 



Elytra yellow, cloudy on the margins at the tip; 3d antennal joint of male 

 smaller than 4th ; 10-14 mm. Canada, Middle and Western States. 



25. vitiosus. 

 Dull black, base of elytra and sides for one-fourth the length red; 12 mm. 



Massachusetts 26. laesus. 



Elytra yellow, sutural band stripe and lateral n>argin black; 9-12 mm. 



New York •. 27. Sayi. 



I y Antennse with third joint very little lou'^er than second and very obviously 



shorter than the fourth 14 



Antennse with third joint very nearly equal to the fourth and much longer 

 than second. 

 Pubescence of thorax rather long and coarse: legs reddish brown ; 12 mm. 



Middle States 28. impolitus. 



Pubescence of thorax verj short. 

 Body uniformly dark brown, nesirly black; 11-13 mm. Pennsylvania, 



Illinois, Hudson's Bay 29. $iOCer. 



Thorax red ; 11-14 ram. Georgia, Mass.. Ill 30. rubricollis. 



14. — Black, legs ferruginous 15. 



Black, prothorax more or less red 19. 



Black, elytra more or less brown-red or scarlet 20. 



Black, protho)-ax deeply punctured ; elytra red at base and at sides in front; 



9.5-11 mm. Canada, New England 31. seniicilicttis. 



Black, legs piceous; elytra dirty pale 3^ellow, suture and margin narrowly 



black; 8mm. New York 32. inilitaris. 



General color yellow-brown, small species 21. 



15. — Prothorax finely and sparsely punctate; antennse ferruginous joints 2-3 

 smaller than usual, together scarcely longer than the fourth ; 7 mm. Lake 



Superior 33. subtilis. 



Prothorax deeply rather densely punctured 16. 



16.— Pubescence black 17. 



Pubescence brown or brown-yellow 18. 



