44 AMERICAN COLEOPTEPvA. 



It occurs in Canada, the New England States and westward to 

 California, Oregon and British Columbia, extending southward 

 along the Rocky Mountains to southern Colorado. 



Subgenus TRI^.SfA Lee. 



Prothorax not wider in front of base. Prosternum margined at 

 tip. Apical spur of anterior tibije trifid. Middle tibise not dentate 

 on the inner side in the males. Hind tibise pubescent on the inner 

 side in the males. 



The essential character for the definition of this subgenus is 

 afforded by the structure of the apical spur of the anterior tibise, 

 which is trifid in both sexes. Otherwise the characters are as in 

 Amara s. s., except that the posterior tibise are less densely pubes- 

 cent on the inner side in the males. The species bear most resem- 

 blance to A. impuncticoUis, and in all but one of those of our fauna 

 the scutellar stria terminates at base in an ocellate puncture. All 

 the femora have two setigerous punctures along the inner margin, 

 and the middle and hind tarsi have the basal joint grooved on the 

 outer side. The number of anal setre difl^ers in the sexes, being one 

 each in the males, two in the females. 



Our species may thus be separated : 



Scutellar stria of elytra terminating at base in an ocellate puncture. 



Antennje witb tbe three or four basal joints pale, the outer ones darker. 

 Legs rufotestaceous. 



Prothorax narrowed from base to apex ; posterior lateral setigerous punc- 

 ture nearer the basal than the side margin, hind angles obtuse ; fourth 

 joint of antennie in great part pale. Length .22-. 32 inch. 



28. aiigustatii Say. 

 Prothorax narrowed from slightly behind the middle to apex, the sides 



subparallel behind, posterior setigerous puncture equidistant from 

 basal and lateral margins, hind angles sliarply rectangular; fourth 

 joint of antennse in great part piceous. 

 Sides of body beneath and abdomen smooth ; thorax about one-half 

 wider than long, apex emarginate. Length .22-. 32 inch. 



29. pallipes Kirby. 

 Sides of body beneath and abdomen coarsely, sparsely punctate; thorax 



less than one-half wider than long, ai)ex feebly emarginate. Ijength 



.27-.34 inch 30. lougiila Lee. 



Legs in front part piceous; hind angles of thorax subrectangiilar. I.,ength 



.27.-.34 inch 31. Nciliila Zimm. 



Antenuie and legs entirely rufotestaceous; ujiddle lobe of apical spur of ante- 

 rior tibise obtuse at tip; thorax with the posterior lateral setigerous 

 ])iuicture nearer the basal than the side nnirgin. Length .32-. 34 inch. 



32. bt'If'rag<'i Horn. 



Scutellar stria of elytra without ocellate puncture at base; legs rufopiceous. 



Length .29-.32 inch 33. arowolata n. sp. 



