82 MEMOIRS ON THE COLEOPTERA. 



larger prothorax and shorter and paler elytra; it is not closely allied 

 to any other species. 



Subgenus Lamiota Csy. 



This group appears to be confined to the northern Pacific coast 

 fauna, where it is represented by a number of well differentiated 

 species, the two following being about as large as keeni though less 

 stout and with a very different form of head: 



Atheta (Lamiota) achromata n. sp. Stout, moderately, the abdomen 

 strongly shining, deep black, the elytra feebly picescent, the legs pale; 

 micro-reticulation strong, not very fine, forming very fine close and 

 feeble transverse strigilation on the abdomen; punctures fine, not 

 dense, asperulate, very fine and sparse on the abdomen, the pubescence 

 palish, rather long and coarse but not dense; head nearly as long as 

 wide, the eyes well developed, moderately convex, at their own length 

 from the base, the tempora behind them rapidly converging and evenly 

 arcuate to the base, the carinse fine, not quite entire; antennse black, 

 gradually pale basally, rather long, moderately thick, distinctly incrassate 

 distally, third joint evidently longer and more obconic than the second, 

 the fourth very little longer than wide, the outer joints about a third 

 wider than long, the last gradually pointed from near the base, barely 

 as long as the two preceding; prothorax short, much wider than the head, 

 three-fifths wider than long, parallel, the sides broadly subangulate 

 just before the middle, the base rounded; elytra about a fifth wider, 

 the suture a third longer, than the prothorax, subparallel, transverse; 

 abdomen nearly as wide as the elytra, parallel, slightly narrowing apically, 

 the fourth and fifth tergites equal in length ; mesosternal process extending 

 to nearly apical third of the cox3e ; where it becomes narrow, parallel 

 and moderately acute, the apex very free, separated from the broadly 

 and obtusely angular metasternal projection by a depressed interval 

 which is half as long as the width of the middle femora. Length 3.0 

 mm.; width 0.73 mm. British Columbia (Metlakatla), Keen. 



In the male the head is narrowly and feebly impressed along the 

 median line, the impression bifurcating anteriorly, and the pronotum 

 has a large depression occupying median third, from base to near 

 the apex. The head in keeni is much larger, parallel at the sides, 

 more transverse, with the shorter tempora as prominent as the eyes, 

 and, in the male, it only has a central foveiform depression of com- 

 paratively small size. The sixth tergite in the male of achromata 

 is nearly as in keeni, being broadly arcuate and strongly, coarsely 

 crenulate between the long arcuate lateral processes, which, in 

 the former, extend posteriorly a little further than the median part. 



