46 AMERICAN COLEOPTERA. 



Resembles most closely A. longula, from which it is recognizable 

 by the impunctate parapleurse and sides of metasternum and abdo- 

 men, as well as by the proportionally wider prothorax, the apex of 

 which is more distinctly emarginate. From angustata it is readily 

 distinguishable by the characters given in the table. From scihila 

 it differs by the color of the legs and the slightly different form of 

 thorax, while the color of the antennae, different form, and acute 

 middle lobe of the trifid spur of the anterior tibise separate it from 

 helfragei, and the presence of an ocellate puncture at the base of the 

 scutellar stria of the elytra will serve to distinguish it from afoveolata. 



It occurs in Canada, the Lake Superior region, Mt. Washington 

 and Shelburne, New Hampshire, Cambridge, Massachusetts, New- 

 York, New Jersey, Iowa and Wisconsin. 



30. A. longula Lee. 



This species resembles most closely J. ^^ai^ipes. The prothorax, 

 though proportionally longer as compared with its width, is nearly 

 of the same form, being narrowed anteriorly from slightly behind 

 the middle to the apex, with the sides arcuate in front, subparallel 

 behind, and the hind angles sharply rectangular. The apex, how'- 

 ever, is only very feebly emarginate. Beneath, the meso- and 

 raetasternal episterna, sides of metasternum and of the ventral seg- 

 ments are coarsely, though usually sparsely, punctured, while in 

 pallipes the body beneath is impunctate. In length it varies from 

 .27-.34 inch ; 6.75-8.5 mm. 



From scitida it is distinguishable by the color of the legs and 

 slightly different form of the thorax. The punctuation of the under 

 side is much more marked than in the latter species, in many speci- 

 mens of which it is almost or entirely wanting. From our other 

 species it is recognizable by the characters given in the table. 



It occurs along the Pacific Coast from British Columbia to 

 Southern California. 



31. A. scitula Zimm. 



Separable from our other species of the subgenus by the color of 

 the legs, which are entirely or in great part piceous, the tibise and 

 tarsi sometimes rufopiceous, while the femora usually have a more 

 or less metallic lustre. The meso- and metasternal episterna are 

 often very sparsely punctured, but this character does not appear to 

 be constant in any degree. The thorax is narrowed anteriorly from 



