8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



3(2). Pronotum with posterior setiferous puncture far forward from posterior 



angle (fig. 27) 4 



Pronotum with posterior setiferous puncture at posterior angle (figs. 



29, 30, 31) 11 



4(3). Head with frontal impressions sharply impressed; eight or fewer seti- 

 ferous punctures in posterior series on eight stria of elytron .... 5 

 Head with frontal impressions shallow; nine setiferous punctures in 

 posterior series on eighth stria of elytron . .21. sphodrinus LeConte 

 5(4). Head with frontal impressions diverging posteriorly; if entire dorsum 



microreticulate, right paramere short 6 



Head with frontal impressions recurved posteriorly; entire dorsum 

 strongly microreticulate; right paramere elongate. 1. inopinus Casey 

 6(5). Pronotum with hind angles obsolete; sides of pronotum entirely ar- 

 cuate 7 



Pronotum with hind angles distinct 9 



7(6). Male with sixth abdominal sternum weakly lobed; median lobe of aedea- 



gus narrower, tip more prominent (figs. 5, 6) 8 



Male with sixth abdominal sternum more strongly lobed; median lobe 



broader and tip rounded (fig. 7) 7. cochlearis, new species 



8(7). Male with median lobe with tip blunter (fig. 5). 



5. fenyesi fenyesi sensu stricto Csiki 

 Male with median lobe with tip narrower (fig. 6). 



6. fenyesi fenderi, new subspecies 



9(6). Mesepisternum with numerous distinct punctures 10 



Mesepisternum without punctures, or at most with a few shallow punc- 

 tures on concave portion 4. infernalis Hatch 



10(9). Pronotum with sides before hind angles strongly sinuate. 



2. pumilus pumilus sensu stricto Casey 

 Pronotum with sides before angles from slightly sinuate to slightly 



arcuate 3. pumilus willamettensis, new subspecies 



11(3). Hind trochanter long, about half the length of hind femur; body length 



less than 9 mm 12 



Hind trochanter short, about a third the length of hind femur; body 



length greater than 9 mm 20. falli Van Dyke 



12(11). Hind trochanter blunt at tip; pronotum without outer pair of longitu- 

 dinal impressions 13 



Hind trochanter slightly pointed at tip; pronotum usually with outer 



pair of longitudinal impressions present . . .14. angustus Dejean 



13(12). Tarsus with last article with setae on ventrolateral margins .... 14 



Tarsus with last article without setae on ventrolateral margins . . .15 



14(13). Male with sixth abdominal sternum with tubercules relatively small and 



sharp; inhabits Marin County, Calif . . 9. marinensis, new species 



Male with sixth sternum with tubercules relatively large and blunt; 



inhabits southern Humboldt and northwestern Mendocino Counties, 



Calif 11. mattolensis, new species 



15(13). Male with sixth abdominal sternum without prominent lobe at apical 



margin 



16 



Male with sixth sternum with long, narrow, truncate lobe at apical 

 margin (fig. 10); frontal impressions forming angle of less than 



80° 10. lobatus, new species 



16(15). Head with frontal impressions not recurved, forming an angle of less 

 than 80° 17 



