170 [September, 



8. D. aenescens, subelongatiS; cylindricus, nigro-pilosellus, vix subfilis- 

 sime cinereo-pubeecens, thorace subtransverso, parce punctulato, lateribus et 

 angulis posticis valde rotundatis, elytris dorso subdepressis sat dense grosse 

 punctatis. Long. -10. 



San Diego ; the male is a little narrower than the female. 



A b. 



9. D. CO n s t ric tu s , elongatas, a?neo-fQscus, subtiliter cinereo-pubesceng, 

 non pilosellus, thorace latitudine fere longiore, capiie vix latiore ante medium 

 angustato et paulo constricto, elytris subtilliter punctatis, antennis pedibusque 

 rufis. Long. 09. 



San Diego, rare. The sides of thorax are almost straight, and parallel, 

 with the exception of the sinuosity produced by the anterior constriction. 



A c. 



10. D. canescens,' subelongatus subcylindricus, aeneo-niger, irregulariter 

 longius cinereo-pubescens. thorace transverso, lateribus valde rotundatis, serru- 

 latis, confertim punctulato, vittis denudatis notato, elytris sat dense punctatis 

 maculis denudatis plaribus ornatis. Long. -15. 



Mannerheim, Bull. Mosc. 1842, 248. 



San Jose and San Francisco, very abundant. The description of Mannerheim 

 is not at all characteristic. The male is narrower than the female ; the inferior 

 segment of the abdomen is short, and articulates with an anal segment. 



11. D. rot u n d i col 1 i s , elongatus, subcylindricus, aeneo-niger, subirregu- 

 lariter cinereo-pubescens, thorace rotundato, lateribus serrulatis, elytris dorso 

 subdepressis, sat dense grossius punctatis, maculis subdenudatis vix conspicuis 

 notatis. Long. "ll. 



San Jose, abundant ; the male has the last ventral segment deeply excavated. 



12. D, difficilis, elongatus, subcylindricus, aeneo-niger, irregulariter 

 cinereo-pubescens, thorace subtransverso, antrorsum angustato, lateribus serru- 

 latis valde rotundatis, sat dense puuctato, elytris sat dense punctatis, maculis 

 indistinctis subdenutatis notatis. Long. -11. 



San Jose. Very similar to D. canescens, but the thorax is less transverse, 

 and less thickly punctured ; the spots on the elytra are less distinct ; they form 

 three transverse bands and a mark at the base. The male has the last ventral 

 segment small and canaliculate ; it articulates with an anal segment. 



13. D. s en i 1 i s , elongatus, dense cinereo-pubescens, aeneo-piceus, thorace 

 opaco punctulato, subquadrato, antrorsum subangustato, lateribus serrulatis vix 

 rotundatis, elytris confertim subtilius punctatis. Long. -IS. 



Fort Laramie, Nebraska Territory. 



14. D. obscurellus, subelongatus, niger vix aenescens, subtilissime vix 

 conspicue cinereo-pubescens, capite thoraceque alutaceis, parce punctatis, hoc 

 rotundato, serrulato, convexo, elytris tliorace latioribus, dorso vix depressis, sat 

 dense grossius punctatis. Lon. -09. 



San Diego, one specimen. Resembles in form D. rotundicollis, but is smaller, 

 and with the pubescens scarcely visible. 



15. D. 1 u t eip es , aeneus, elongatus, subcylindricus, longe injequaliter 

 cinereo-pubescens, thorace non transverso, convexo punctato, lateribus serrulatis 

 rotundatis, antrorsum subangustato, elytris grossius distincte j)unctatis, dorso 

 non depressis, maculis subdenudatis atris notatis, antennarum basi pedibusque 

 rufo-flavis. Long. -l. 



One specimen, San Diego. 



16. D. pusiUus, aeneo-niger, oblongo-elongatus, parcius longe cinereo- 

 pubescens, thorace opaco, confertissime ruguloso, transverso, lateribus eubser- 



