312 MEMOIRS ON THE COLEOPTERA 



female; under surface and legs deep black, the stiff setae fulvous; 

 head not so small, fully half as wide as the prothorax; eyes much 

 more convex and prominent, the strioles normal, linear and oblique; 

 antennae almost similar, except that both the two basal joints are 

 in great part piceous; prothorax nearly similar but shorter, somewhat 

 more than one-half wider than long, the sides slightly diverging bas- 

 ally; apex similar; basal angles right, sharp, the puncture similar 

 in position but smaller; impressions and foveae nearly similar, the 

 former less pronounced; elytra even more gradually narrowed and 

 rounded behind, one-half longer than wide, at the middle just visi- 

 bly wider than the prothorax; striae nearly similar but still finer, the 

 lateral series interrupted medially; intervals virtually flat in gen- 

 eral plan but unevenly undulated; hind tarsi long and slender. 

 Length ( 9 ) 6.0-6.5 mm. ; width 2.6-2.7 mm. Lake Superior (Duluth 

 and Marquette) aeneolucens n. sp. 



The species described by LeConte under the name difficilis 

 afterwards suppressed is truly a close relative of impuncticottis, 

 but seems distinct by reason of its larger size and broader outline. 

 Two allied species have also been confused under the name fallax; 

 the eastern form, or true fallax, is larger and stouter than hesperia; 

 it extends from the Atlantic seaboard, at least as far to the south 

 as North Carolina and westward to Colorado, while hesperia ex- 

 tends from the Pacific coast eastward as far as New Mexico. The 

 segregation of these two forms in large series demonstrates their 

 specific distinctness, but this might not be so evident in comparing 

 single specimens. 



The division of Amara having simple male prosternum and with- 

 out an ocellate subscutellar puncture, is composed of far more 

 numerous species than that having the subscutellar puncture, and 

 they are more diversified in structure and coloration. I have found 

 the position of the posterior thoracic puncture a particularly valu- 

 able and easily observed taxonomic character in this division of 

 the genus much more decisive than the carination of the second 

 or third antennal joint, which is often very difficult to determine. 

 The small aeneous species allied to polita, having this puncture 

 crowded into the extreme apex of the thoracic angle, have occa- 

 sionally a remarkable type of pronotal punctuation, as related under 

 that species and piceola. I cannot imagine what the eastern forms 

 placed under polita by Hayward can be, but they are not that spe- 

 cies in all probability; convexa Lee., is evidently different, but has 

 been sunk in synonymy under polita. A few species such as eras- 



