BYRRHID^: 23 



the tarsi slightly, paler; head rather small, very convex, strongly, 

 very densely punctate throughout, the pubescence short and but 

 slightly variegated, the transverse line and pale spots obsolescent; 

 prothorax evidently less than half as long as the basal width, the 

 very strongly converging sides almost straight; punctures fine but 

 deep, even in size and extremely close; pubescence black, generally 

 forming an elongate medial rhomboid of densely aggregated lines 

 medially, variegated slightly though more sharply with pale fulvous 

 anteriorly and sublaterally and more diffusely elsewhere; scutellum 

 with dense and rather less decumbent black hairs; elytra nearly 

 one-half longer than wide, parallel, the sides rounding through the 

 parabolic tip in posterior third; pubescence close, black, more densely 

 aggregated interruptedly on the alternate intervals, the transverse 

 silvery bands as in americanus; abdomen finely but distinctly, 

 closely asperulate, the metasternum more coarsely, deeply and 

 closely asperato-punctate, with a smooth enlargement of the fine 

 impressed median line just behind the middle. Length 7.1-7.25 

 mm.; width 4.2-4.3 mm. British Columbia. [B. concolor Kirby, 



Richardson Faun. Bor. Am., IV, p. 117] concolor Kirby 



A Similar in general to the preceding but stouter and materially 

 larger, similar in coloration and nearly so in sculpture and pubes- 

 cence; head densely, rather deeply punctate, convex, not densely 

 pubescent except in a small central subprominent aggregation, 

 the impressed line represented by a short transverse flat puncture- 

 less spot, the pale points not evident; prothorax similar, except 

 that the fine punctures are not so dense and become notably finer 

 and closer medially; elytra nearly similar throughout; abdomen 

 with the asperities stronger, though less definitely sharp, and 

 sparser, bearing hairs which are a little coarser and distinctly 

 longer than in concolor; metasternum more coarsely punctato- 

 rugose and without a definite smooth spot on the median line. 

 Length (c?) 8.1 mm.; width 5.0 mm. Washington State. 



pacificus n. subsp. 



Mesosternal emargination broader, shallow 9 



9 Color deep black, the legs barely at all paler, the tarsi rufo-piceous; 

 head rather well developed, convex, very densely punctured, the 

 pubescence short, notably coarse, somewhat variegated, the trans- 

 verse line and pale spots obsolete or nearly so; prothorax decidedly 

 less than half as long as the basal width, the converging sides 

 nearly straight, the punctures fine and very close; pubescence notably 

 longer than usual, somewhat shaggy, black, variegated with fulvous, 

 the black hairs forming some uneven condensed lines, the medial 

 rhomboidal figure broad; scutellum densely nigro-pubescent; elytra 

 short, not over a third to fourth longer than wide, rather rapidly 

 rounding posteriorly and obtusely ogival at tip, the general pubes- 

 cence very short, blackish, sprinkled with silvery, the dense conden- 

 sations on the alternate intervals, formed of longer deep black hairs, 

 tending to spread into an ill-defined spot at three-fifths and outside 

 the median line, the transverse silvery bands rather finer and more 

 feebly defined than usual ; abdomen rather coarsely, densely asperate- 



