﻿Dec. 1895] AViCKHAM. COLEOrXERA OF N, E. AMERICA. 183 



Basal fovere punctulate, elytral stria; deeper caudicalis. 



31. Larger species (.60 in.) less slender COrvinus. 



Smaller species (.38 in.) luctuosus. 



32. Ligula obtusely carinate, thorax strongly margined 33 



Ligula not carinate, thorax very finely margined 35 



33. Hind thoracic angles obtuse, elytra ^ dull gravis. 



Hind angles rectangular 34 



34. Very brilliant (^ , 9 ). Middle tibia; ^ with acute subapical tooth and feeble 



obtuse apical process scrutator. 



Moderately brilliant (^) or duller (9); sides of thorax distinctly sinuate be- 

 hind tartaricus. 



Less brilliant, 9 dull ; thorax scarcely sinuate near base haldemani. 



35. Purplish above, thoracic impressions not punctured purpuratus. 



Black above, thoracic, impressions punctured mutus. 



36. Hind angles of thorax small, dentiform, elytra shining pennsylvanicus. 



Hind angles rectangular, elytra 9 dull vitreus. 



Hind angles obtuse, elytra 9 dull 37 



37. Sides of prothorax broadly depressed orinomum. 



Sides of prothorax narrowly depressed luczotii. 



38. Metathoracic episterna long 39 



Metathoracic episterna short 4 ' 



39. Scutellar stria long 40 



Scutellar stria wanting, thorax nearly square, rounded at angles,color black, legs 

 reddish ery thropus. 



40. Elytral striae smooth ; antennae and legs reddish patruelis. 



Elytral striae punctured in anterior half, antennae and legs reddish, thighs usually 



darker f emoralis. 



Elytral striae obsoletely punctured, antennas and legs bright ferruginous, surface 

 iridescent COrrusculus. 



41. Prothorax not margined at base near hind angles, scutellar stria long, elytra] 



striii: fine, surface brassy vindicutus. 



Prothorax with base margined near hind angles 42 



42. Outer basal fovea wanting 43 



Both foveae present, the outer one small hudsoniciis. 



43. Medium-sized, hind angles of thorax more or less prominent empetricola. 



Smaller, prothorax broader, more narrowed behind sides suddenly sinuate, hind 



angles prominent mandibularis. 



P. congestus A/r//. — Black, thorax longer than broad, narrowed 

 and sinuate posteriorly, basal margin straight, not margined toward the 

 sides. Elytral striae deeper behind. Length, .47-. 70 inch = 12- 

 1 7.5 mm. 



Habitat : Alaska, California (San Diego). The Wisconsin record, 

 on the strength of which it is here inserted should be carefully verified. 



P. adoxus Say. — Black, antennre and palpi dark rufous, legs and 

 abdomen piceous. Thorax gradually narrowed behind, sides exciirved 



