92 MEMOIRS ON THE COLEOPTERA 



sexes more depressed than in either of the two preceding. Color 

 deep black throughout, the anterior and middle tarsi dark rufous; 

 surface polished, the elytra (9) sericeo-opaque; head three-fifths 

 as wide as the prothorax, a little larger (9 ), the foveae small but not 

 isolated from the suture as they are in the preceding, the antennae 

 and palpi slender, testaceous throughout; eyes as usual; prothorax 

 transverse, one-half to three-fifths wider than long, throughout as 

 in laticeps but with somewhat more arcuate sides and with the base 

 toward the sides a little more anteriorly arcuate, so that the basal 

 angles, while more obtuse, are more narrowly blunt and therefore 

 better defined, the foveae similarly deep and the diffused punctu- 

 lation thence to the sides similar; elytra short, one-half longer than 

 wide to obviously less, the striation and intervals in both sexes as 

 in laticeps and montanns, the surface however less convex and the 

 apices more abruptly and broadly obtuse, with the sinus wholly 

 obsolete, the edge only a little less arcuate at its usual position; 

 basal and post-coxal punctures of the abdomen much more numerous 

 and widely diffused than in either of the preceding; legs and tarsi 

 almost as in montanns. Length (cf 9 ) 10.8 mm.; width 4.1-4.3 mm. 

 Lake Superior (Duluth and \Vhitefish Point) rufimanus Lee. 



5 Head very large, sometimes nearly as wide as the prothorax 6 



Head moderate in size, though always evidently more than half as wide 

 as the prothorax 7 



Head unusually small in both sexes, about one-half as wide as the pro- 

 thorax; pronotal foveae usually very feeble 35 



6 Form oblong, piceous-black, shining, head large [not narrower than 

 the prothorax in diagnosis but probably overstated], subquadrate, 

 slightly retracted behind the eyes, smooth, the frontal impressions 

 small, foveolaeform, the frontal suture distinct; prothorax subquad- 

 rate, slightly shorter than wide, rather rounded at the sides, truncate 

 at apex and base, the hind angles slightly obtuse and rounded ; surface 

 slightly convex, finely margined at the sides; anterior transverse 

 impression remote from the margin, arcuate; median stria deep, 

 abbreviated anteriorly, the basal foveae small, deep, feebly punctate, 

 the punctures extending to the angles; elytra obscure castaneous, 

 [slightly bronzed - - Proc. Acad., 1865], parallel, the apices not sinu- 

 ate, deeply striate, the intervals feebly convex, the marginal series 

 of foveae not interrupted; antennae, palpi, epipleura and legs ferru- 

 ginous. Length 8.7 mm.; width 3.2 mm. Lake Superior. 



megacephalus Lee. 



Form nearly similar, moderately convex, highly polished throughout 

 (c?),pale castaneo-testaceous, the elytra not evidently darker, the 

 under surface, legs, mouth parts and antennae very pale testaceous; 

 tip of mandibles and disk of labrum blackish; head (cf) scarcely 

 more than three-fifths as wide as the prothorax, the foveae minute 

 but lineiform, the eyes moderate and prominent, the antennae 

 slender; mandibles short, very thick, polished, but with the inner 

 part very minutely and closely longitudinally strigilate, except 

 toward base; prothorax transverse, one-half wider than long, parallel, 

 the sides very moderately rounded, the apex slightly narrower than 



