OF WASHINGTON, VOLUME XIV, 1912. 29 



DIVISION II. 

 Interspace 5 not decidedly more elevated than 3, elytra convex 



or flat, never strongly concave SUBDIVISION C 



Interspace 5 decidedly more elevated or broader than 3, elytra 



usually concave dorsally SUBDIVISION D 



SUBDIVISION C. 



With none of the interspaces elevated, but in their place slightly 

 broader, flattened, nude, and impunctate intervals which 

 are interrupted at long distances by small tumid elevations, 

 bearing a dense tuft of whitish setae SECTION A3 



With the alternate interspaces strongly elevated or but very 



feebly elevated and crested with silvery setae SECTION A4 



SECTION A3. 



Length 2.7-3.4 mm. Prothorax fully as wide anteriorly as long, 

 strongly narrowed from apex to base, the sides broadly 

 strongly sinuate throughout, dorsal area granulato-punctate, 

 the costaa obtuse, crested with yellowish pubescence. 



nucleatus Casey 

 California (Monterey). 



SECTION A4. 



Pronotum with three pairs of more or less clearly defined, obtuse, 

 feebly elevated, tortuous, interlacing costae crested with 

 silvery pubescence SUBSECTION Bl 



Pronotum with one or two pairs of obtuse costae either straight 



or occasionally sinuate SUBSECTION B2 



SUBSECTION Bl. 



Elytra with interspaces 3, 5, and 7 with a double or triple row 

 of very short setae, greatly more elevated than even inter- 

 spaces, strial punctures deep, regular, well defined, without 

 setae SERIES Cl 



Elytra with interspaces 3, 5, 7 with a single row of long over- 

 lapping setae, scarcely more elevated than even interspaces, 

 but clearly distinguished from them by bearing the long 

 setae, strial punctures each with a bristle pointed obliquely 



backward SERIES C2 



SERIES Cl. 



Length 3 mm. Body ferruginous, prothorax broader than long. 



borealis Horn 

 Michigan (Marquette). 



Length 3.2 mm. Body piceous, prothorax longer than broad, 

 posteriorly narrower than elytra, sides strongly sinuate and 

 narrowed posteriorly, posterior angles acute, anterior 

 broadly rounded; head longer than broad, front granulate, 



