426 Trans. Acad. Set. of St. Louis. 



Head large, evidently wider than the elytra, the latter large and obviously 

 longer as well as wider than the prothorax. Body stout, parallel, only 

 moderately convex, shining, blackish-piceous throughout, the elytra 

 nubilously rufescent in nearly basal half; legs pale, the antennae darker, 

 rufous; head behind the antennae wider than long, parallel at the sides, 

 the angles broadly rounded as usual; front broadly impressed at the 

 middle and with a few setigerous punctures, with others also sparsely 

 scattered along the base and toward the sides; antennae with the sec- 

 ond joint obviously shorter than the third, the latter obconical and as 

 long as the next two combined; prothorax but slightly longer than 

 wide, much narrower than the head, with the sides very feebly converg- 

 ing posteriorly; elytra somewhat longer than wide, rather strongly 

 rugulose; abdomen behind the middle as wide as the elytra, finely, 

 sparsely punctulate toward the sides only, the median parts impunc- 

 tate. Male with the sixth ventral broadly, feebly and evenly arcuate at 

 tip, the female smaller in size and rather more slender, with the sixth 

 ventral narrower and more strongly though evenly rounded at tip. 

 Length 6.0-7.0 mm.; width 0.9-1.05 mm. New Hampshire (White 

 Mts.), British Columbia (Stickine River), Queen Charlotte and Prince 

 of Wales Islands macrocephalns Nord. 



Head less developed, never wider than the elytra 2 



2 — Elytra equal in length to the prothorax. Body smaller in size than the 

 preceding and more convex, blackish-piceous when mature, with the 

 abdomen paler and rufous, gradually clouded posteriorly with faintly 

 darker plceous, the elytra nubilously pale at the basal margin and some- 

 times narrowly along the suture; legs and antennae pale rufous; head 

 behind the antennae scarcely as long as wide, parallel at the sides, 

 almost punctureless, except a few large setigerous punctures scattered 

 along the base, a few at the sides and a very large setigerous puncture 

 in the usual position above each eye; front broadly, feebly impressed; 

 antennae with the third joint only slightly longer than the second and 

 nearly as long as the next two combined; neck about three-fifths as 

 wide as the head in the male, not quite so wide in the female; protho- 

 rax but little longer than wide and only very slightly narrower than the 

 head in the male, rather more distinctly narrower in the female, the 

 sides subparallel and broadly arcuate ; elytra quadrate, slightly wider 

 than the prothorax, polished, almost completely impunctate, feebly un- 

 dulato-rugulose ; abdomen almost as wide as the elytra, rather finely but 

 asperately, conspicuously and sparsely punctate, more sparsely and ob- 

 soletely so toward the middle. Male with the body noticeably stouter, 

 the sixth ventral broadly and evenly rounded behind, the female hav- 

 ing the same segment almost similar, being but slightly more narrowly 

 and strongly rounded. Length 5.6 mm.; width 0.85-0.95 mm. Lake 

 Superior americanus n. sp. 



Elytra distinctly shorter than the prothorax; basal angles of the head 

 broadly rounded as usual 3 



8 — Body perfectly parallel, the head, prothorax and elytra equal in width. 

 Rather slender in form, convex, shining, evenly ferruginous in color 

 throughout the body, legs and antennae, the elytra not at all darker at 

 any point; head rather well developed, fully as wide as the elytra in the 

 male, rather narrower in the female, slightly wider than long behind the 



