AMARINVE 299 



not rounded, the puncture symmetrically close to the angulation; 

 surface completely impunctate, with very fine stria; inner fovea very 

 feeble, linear, short and remote from the base, the outer wholly 

 obsolete; elytra one-half longer than wide, barely at all wider than 

 the prothorax, gradually but not narrowly ogival behind, the par- 

 allel sides broadly arcuate, the lateral series not interrupted; striae 

 fine, feebly impressed, impunctate, the seventh as distinct as the 

 others, the scutellar very long; intervals feebly but distinctly con- 

 vex. Length (cf 9 ) 6.7-6.8 mm.; width 2.7-2.8 mm. British Co- 

 lumbia (Inverness), J. H. Keen keeni n. sp. 



Legs very obscure rufous or piceous as a rule, generally with black 

 femora 9 



9 Body rather broadly oblong-suboval and moderately convex, black, 

 with greenish or cupreo-aeneous lustre, the elytra barely visibly 

 alutaceous or less shining in the female; under surface greenish-black; 

 head very nearly half as wide as the prothorax, the eyes rather large 

 but not very convex; strioles well developed, oblique; antennae long, 

 rather slender, extending well behind the thoracic base, blackish, 

 the first three joints and base of the fourth pale testaceous; prothorax 

 only two-fifths wider than long, the sides feebly converging and 

 nearly straight to beyond the middle, thence rounding and con- 

 verging to the apex, which is two-thirds as wide as the base and 

 rather deeply sinuate, with obtusely prominent angles; basal angles 

 right, the puncture but little further from side than base; impressions 

 subobsolete; stria fine but impressed and distinct, the surface im- 

 punctate; foveae broadly impressed, the inner linear, its own length 

 from the base, the outer extremely feeble, oblique, sometimes obso- 

 lete; elytra one-half (d 1 ) to two-fifths (9 ) longer than wide, gradu- 

 ally rounding behind the middle, very slightly wider than the pro- 

 thorax; striae fine, impunctate, scarcely impressed, the scutellar 

 very moderate; intervals not quite flat. Length (cf 9 ) 6.8-7.6 mm. ; 

 width 3.2-3.35 mm. Lake Superior (Marquette and Bayfield). Six 

 specimens lacustrina n. sp. 



Body almost similarly broad and oblong-suboval, the male shining, green- 

 ish-metallic in lustre; elytra micro-reticulate but shining; under 

 surface shining, greenish-black; legs black, the tibiae dark rufous; 

 head small, not quite half as wide as the prothorax; eyes prominent, 

 the strioles linear and oblique; antennae in great part missing in the 

 type but pale testaceous basally; prothorax transverse, fully one-half 

 wider than long, the arcuate sides gradually nearly straight and sub- 

 parallel posteriorly; apex deeply and evenly sinuate, only two-thirds 

 as wide as the base, the prominent angles very narrowly blunt at 

 tip; basal angles right, not rounded, the puncture close to both 

 base and side but not in the extreme apex of the angle; transverse 

 impressions evident but feeble, the stria distinct in a broad feeble 

 impression; foveae subobsolete and altogether indefinite, the short 

 coarse incised dash of the inner distinct; elytra one-half longer than 

 wide, just visibly wider than the prothorax and gradually ogivally 

 rounded behind from near the middle; striae fine, impunctate, very 

 slightly coarser on the declivity, the scutellar oblique, not free; in- 



