ROLAND HAYWARD. 127 



It seems to be confined to the Pacific coast region, being known 

 to me from various locaHties in California, Oregon, Washington and 

 Vancouver Island. 



117. B. assiinile Gyll. — Form moderately robust; color black, scarcely 

 feneous, the elytra usually piceous or brownish, with a very distinct submarginal 

 spot about one-fourth from apex and the apex pale. Head scarcely narrower 

 than the thorax ; palpi testaceous, darker towards the tip ; antennse about one- 

 half the length of the body, fuscous, the basal joints testaceous. Prothorax very 

 slightly wider than long, distinctly narrower at base than apex, sparsely punc- 

 tate at base; apex truncate; median line fine, abbreviated in front; anterior 

 transverse impression distinct, the posterior feeble ; basal impressions deep, uni- 

 striate ; sides with the margin very narrowly reflexed, strongly arcuate in front, 

 distinctly sinuate behind ; hind angles rectangular. Elytra obloug-oval. nearly 

 twice as wide as the thorax, moderately deeply striate; striaj very distinctly 

 punctate : intervals slightly convex, the third with the first dorsal puncture about 

 one-fourth from base, the second slightly behind the middle. Beneath nearly 

 black, shining, the abdomen often piceous. Legs testaceous. Length .08-. 11 

 inch ; 2-2.75 mm. 



This is the smallest species of the group and one of the smallest 

 of the entire genus. It seems subject to but slight variation, and 

 may be easily recognized from its allies by the above characters. 

 The outer frontal groove is more clearly marked in this than in any 

 other species of the group. 



Its range of distribution is very extended. It occurs throughout 

 a large part of Europe, and in North America is known to me from 

 Canada, Massachusetts, Rhode Island, New York, Pennsylvania, 

 Virginia, Michigan and the Lake Superior regicm, Illinois, Iowa, 

 Missouri, Idaho, California, Oregon and Washington. 



Group xviii. semistriatum. 



Maxillpe with the outer lobe biarticulate ; frontal grooves single, 

 straight, parallel ; eyes moderately large, prominent. Prothorax 

 subcordate. Elytra with the strite abbreviated behind ; intervals 

 with irregular rows of sparsely placed setigerous punctures; humeri 

 rounded. 



This group contains but one species. 



118. B. seiiiitiif riatuin Hald. — Form slightly elongate, convex: color 

 nearly black, scarcely seneous, the elytra often somewhat tiuged with brownish. 

 Head scarcely narrower than the thorax at apex; palpi testaceous; antennse 

 about one-half the length of the body, piceous, the basal .joints paler. Prothorax 

 about one-half wider than long, very distinctly narrower at base than apex; 

 apex truncate ; median line distinct, abbreviated in front ; transverse impressions 

 moderately distinct; basal impressions deep, bistriate; sides with the margin very 

 narrowly reflexed, strongly arcuate in front, sinuate behind ; hind angles rect- 



TRANS. AM. ENT. SOC. XXIV. MAY. 1897. 



