BEMBIDIESLE 165 



than the broadly sinuate apex and four-fifths the maximum width; 

 sides evenly rounded from the rather sharp apical angles to the par- 

 allel basal part, which is nearly a fourth the total length; anterior 

 impression obsolete; base depressed and punctate throughout; stria 

 deeply impressed, subentire; foveae large, broadly impressed, shallow 

 and punctate, the carina rather long and strong; angles right; ely- 

 tra slightly opalescent, more than three-fifths longer than wide, a 

 third wider than the prothorax, parallel, with arcuate sides and very 

 gradually rounded humeri; striae fine, feebly impressed, entire, with 

 more or less evident traces of fine and very irregular punctulation; 

 foveae before basal and before apical third, separated by fully two- 

 fifths the total length. Length (of 1 ) 4.3 mm., width 1.6 mm. 

 British Columbia (Inverness), Keen crassicornis n. sp. 



Sides of the pronotum less steeply sloping, the edge rather widely and 

 strongly reflexed; minute sculpture as in the preceding, feeblest in 

 keeni; antennae not so thick; elytral foveae differing conspicuously 

 in being very much more approximate, separated by a fifth to sev- 

 enth the total length 2 



2 Larger species, the legs obscure rufous, with blackish femora. Upper 

 surface piceous-black, moderately shining; under surface piceous; 

 head orbicular, rather wider than long, three-fourths as wide as the 

 prothorax; antennae fusco-testaceous, filiform, rather thick, three- 

 fourths as long as the elytra, hairy as usual, the medial joints be- 

 tween two and three times as long as wide; prothorax about two- 

 fifths wider than long; base transversely truncate as usual, rather 

 wider than the transverse bisinuate apex, four-fifths the maximum 

 width, widest at two-fifths from the apex; sides evenly rounded from 

 apex to the broad basal sinuation, becoming parallel near the angles; 

 anterior impression very feeble; base with scattered punctures, but 

 feebly depressed medially; foveae very v large and broad, deeply con- 

 cave, the carina distinct, forming one side of the fovea as usual; 

 median stria coarse and deeply impressed, very coarse and deep 

 basally; elytra broad, with parallel and strongly arcuate sides, one- 

 half longer than 'wide, about one-half wider than the prothorax; 

 striae entire, though becoming very feeble at tip, moderately fine, 

 impressed, the irregular punctulation barely evident; foveae asper- 

 ate, at three and four sevenths. Length (9 ) 6.3 mm.; width 2.65 

 mm. British Columbia (Inverness), Keen. [Trechus spec. Mann.]. 



spectabilis Mann. 



Smaller species and more slender, the legs rufous throughout 3 



3 Sides of the prothorax distinctly sinuate basally, becoming parallel 

 in about basal fifth, the hind angles right and very sharp. Body 

 elongate-suboval, convex, moderately shining, piceous-black, the 

 under surface obscure, the legs bright, rufous; head orbicular, as 

 wide as long, fully three-fourths as wide as the prothorax, the sulci 

 broad as usual; antennae long, pale testaceous, nearly as long as 

 the elytra, the medial joints slightly obconic and almost three times 

 .as long as wide; prothorax scarcely a fourth wider than long, barely 

 visibly wider at base than at apex, the latter rather deeply sinuate, 

 with well marked angles; sides rather widely and strongly reflexed, 



