n6 MEMOIRS ON THE COLEOPTERA 



fifths wider than long, parallel, with moderately rounded sides and a 

 very feeble transverse ante-scutellar impression; elytra moderately trans- 

 verse, with straight and feebly diverging sides, at base equal in width to 

 the prothorax, the suture two-fifths longer, the apices feebly sinuate 

 externally; abdomen distinctly narrower than the elytra, parallel, feebly 

 narrowing at apex; middle coxae almost contiguous, the metasternum 

 very short and broadly angulate. Length 2.4 mm.; width 0.62 mm. 

 Idaho (Cceur d'Alene), Wickham. 



To be known at once by the parallel form and broad prothorax, 

 short, somewhat strongly incrassate antennae and cephalic as well 

 as intermesocoxal structure. This species is not a truly typical 

 Atheta. 



Atheta concussa n. sp. General form, coloration and sculpture as 

 in the preceding but stouter; head larger and distinctly wider than long, 

 two-thirds as wide as the prothorax, only just visibly inflated basally, 

 the eyes a little larger and at not evidently more than their own length 

 from the base, the carinae similar; antennae similar but not quite so short, 

 quite as strongly and gradually incrassate distally, the second and third 

 joints equal and a little longer than in subretracta, the fourth fully as 

 long as wide, fifth to tenth gradually a little larger but subsimilar and 

 but little more than one-half wider than long, the last as in the preceding 

 species; prothorax and elytra similar throughout in form but larger and 

 broader; abdomen broader, almost as wide as the elytra, more rapidly 

 and conspicuously narrowed at apex, the fifth tergite similarly but little 

 longer than the fourth; intermesocoxal parts as in the preceding. Length 

 2.4 mm.; width 0.72 mm. Washington State (Spokane), Wickham. 



Belongs to precisely the same small group as the preceding and 

 very closely allied thereto, but differs in the larger and more trans- 

 verse head, less abbreviated antennas, slightly less transverse pro- 

 thorax and longer elytra, more rapidly apically narrowed abdomen 

 and generally distinctly stouter form. Both the above descriptions 

 are taken from the female; in concussa the prothorax is extremely 

 nearly but not quite as wide as the elytral base. 



Atheta esmeraldae n. sp. Moderately stout, rather convex, highly 

 polished, the micro-reticulation everywhere almost obsolete, the rather 

 close, transversely wavy lines of the abdomen very feeble though trace- 

 able; punctures very fine, rather sparse and indistinct, larger, asperulate 

 and moderatey dense on the elytra, somewhat remote on the abdomen; 

 color very deep black, the elytra dark piceo-testaceous, the legs pale; 

 head rather large, evidently wider than long, the eyes moderately large 

 and prominent, at their own length from the base, the tempora rather 

 less prominent, strongly arcuate to the base, becoming parallel near the 

 eyes, the carinae fine, far from entire; antennae short, black, the basal 

 joints pale, the second and third equal, fourth scarcely wider, a little 



