34 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



not at the apices of rather coarse tubercles; elytra narrow, 

 faintly more narrowed and concave posteriorly, interspace 1 

 straight, rather abruptly thickened toward apex, 3 feebly 

 but almost evenly elevated throughout, 5 strongly elevated, 

 more so towards apex, strial punctures small, close set, 



traceable throughout pusillus Lee. 



District of Columbia to Texas. 



Length 2.5 mm. Pronotum subquadrate, subopaque, slightly 

 narrower than elytra, side margins broadly arcuate, scarcely 

 converging posteriorly, median impression without median 

 carina, the punctures, however, situated on the summits of 

 coarse, feebly jelevated tubercles; elytra rather broad, in- 

 terspace 1 not at all more thickened towards apex, in most 

 examples less so, 3 distinctly subobtusely elevated through- 

 out, more strongly at base, 5 strongly elevated to near apex, 

 where it is abruptly flattened, strial punctures very distinct, 



very readily traceable throughout subcostulatus, n. sp. 



Idaho (Centerville). 



SERIES C4. 



Length 3 mm. Pronotum subquadrate, opaque, scarcely at all 

 rounded posteriorly, but the posterior angles very broadly 

 rounded, median impression very broad, its margins acute, 

 nearly parallel and not attaining either anterior or posterior 

 margin, anterior margin with two curvate elevations, in- 

 cluding margins of impression; elytra broad, strongly con- 

 cave posteriorly and with the base strongly emarginate, 

 interspace 1 feebly evenly elevated to near apex, where it 

 is rather strongly thickened, 3 strongly, sharply elevated at 

 base for about one-fourth its length, then flattened and 

 traceable for about to near apex, where it is confused with 

 1, 2, and 4; 5 very strongly elevated to near apex, where it 

 is gradually flattened and curved inward to the apex, strial 

 punctures to interspace 5 scarcely visible, striae appearing 



as feebly impressed narrow lines laqueatus Lee. 



Arizona. 



SUBSECTION B4. 



Length 2. 8 mm. Pronotum broader than long, posteriorly slightly 

 narrower than elytra at base, the side margins broadly 

 curved and narrowed posteriorly, median impression very 

 broad, deep, its margins broadly curved, punctures very 

 fine, simple; anterior margin of prothorax without trace of 

 curvate elevations; elytra very broad and concave, inter- 

 space 1 just visibly elevated, 3 elevated at base for about 

 one-sixth or one-seventh its length, then flattened, but 

 traceable to apex, 5 strongly acutely elevated from base to 



