28 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



SUBDIVISION B. 



Pronotum, when viewed from side, with a strong flexure an- 

 terior to middle SECTION Al 



Pronotum, when viewed from side, straight, without flexure. 



SECTION A2 

 SECTION Al. 



Length 3.8 mm. Castaneous, elytra slightly narrowed anter- 

 iorly, margins of head but slightly flexed, front faintly con- 

 cave, granulate, epistoma with anterior margin deeply acute- 

 ly emarginate, prothorax with the side margins acutely angl- 

 ed slightly anterior to middle posterior, to which they are 

 straight and convergent; two pairs of dorsal longitudinal 

 costse, the outer pair obtuse, feebly sinuate, the inner pair 

 tortuous, dichotomous, near either extremity the branches 

 again united at either margin; even interspaces of elytra a 

 little narrower than strial punctures, the latter regular, sub- 

 quadrate flexuosus, n. sp. 



Washington (Hoquiam. ) 



SECTION A2. 



Length 4 mm. Piceous, pronotum with two distinct pairs of 

 longitudinal costaa, the middle pair equally elevated through- 

 out, irregularly curved, broken at posterior 1/4, then continu- 

 ed in closer approximation and slightly diverging to posterior 

 margin, outer pair sinuate and broadly joined to inner or 

 outer margin; margins of prothorax broadly rounded, head 

 faintly concave, epistoma slightly elevated, anterior margin 

 deeply rather than broadly emarginate; elytral sculpture as 



in the preceding complex Lee. 



California (Punto de Los Reyes). 



Length 3.7 mm. Piceous, pronotum with middle pair of pronotal 

 costae broken up into acute elevations connected by feebly 

 elevated ridges, these elevations form an almost perfect 

 square at centre of pronotum, posteriorly and anteriorly, 

 however, represented by two acutely elevated lines, outer 

 pair joined to inner pair on anterior margin in a broad U 

 curve, becoming obsolete or but feebly elevated posteriorly ; 

 side margins of prothorax broadly curved, scarcely narrowed 

 posteriorly, posterior angles acute and noticeably curved 

 backward; elytral sculpture and structure as in flexuosus; 

 head similar to complex, but with epistoma more convex 

 and its anterior margin very feebly broadly emarginate. 



tuberculatus, n. sp. 

 South Dakota (Elmore). 



