H. C. FALL. 107 



close and even. Abdomen sparsely finely punctate above, more con- 

 spicuously so beneath. Prosternal sutures prominent, the hypomera 

 nearly flat, feebly impressed at sides, about one-half as wide at apex 

 as at the coxal fissures, which are closed and just perceptibly shorter 

 than the adjacent hypomeral width. Length 4.9 mm. 



Lake Tahoe (Tallac), Calif. Collected by Dr. Fenyes. 



The type is a male having the sixth ventral broadly but 

 distinctly emarginate in circular arc, the surface near the 

 margin bearing numerous yellow setse which are longer at 

 sides. In the modification of the sixth ventral of the male 

 tallaci agrees with grividus Csy. which is differently colored, 

 has the pronotum in part polished, the tenth antennal joint 

 transverse, and the prothorax sparsely and unevenly punc- 

 tate. A male specimen in my collection from Lake County, 

 California, is quite surely Casey's foraminosus, which was de- 

 scribed from the female. In this male the sixth ventral is 

 setiferous posteriorly, but the segment is scarcely perceptibly 

 emarginate. Very closely allied are deceptivus Fall, and 

 relictus Fall, the sixth ventral of the male in both of these 

 being precisely as in foraminosus. 

 B. dissimilis n. sp. 



Black, elytra rufo-ferruginous, with the base and suture dusky, 

 antenme, legs and abdominal apex rufous. Head and thorax densely 

 granulato-reticulate, the former dull, the latter feebly shining, abdo- 

 men feebly reticulate and shining, elytra polished. Second antennal 

 joint a little stouter and slightly longer than the third, the latter three- 

 fourths longer than the fourth, penultimate joints a little wider than 

 long. Head distinctly but sparsely and rather finely punctate, vertex 

 feebly tumid at middle, behind which is a more or less distinct fovea ; 

 epistomal angles feebly finely tuberculate, suture fine and distinct but 

 scarcely impressed. Prothorax evidently wider than long, sides paral- 

 lel and slightly arcuate in apical three-fourths, then broadly rounded 

 and convergent at base, the base angles rounded and not defined ; 

 dorsal line fine but distinctly impressed, the punctures moderate in 

 size, separated by about their own diameters. Elytra at base scarcely 

 wider than the prothorax, nearly as long as wide, sides moderately 

 divergent, punctuation rather close and well impressed. Abdomen 

 gradually notably wider behind, finely sparsely punctate, beneath 

 more evidently so. Prosternal sutures distinct, oblique, hypomera 

 nearly flat, rather feebly impressed along the outer margin, the width 

 at apex about half that at the coxal fissures, the latter closed and a 

 little shorter than the adjacent hypomeral width. Length 3.6-4.2 mm. 



TRANS. AM. ENT. SOC, XXXVI. MAY, 1910. 



