1851.] 313 



striatis versus suturam depressis, lateribus sensim declivibus, femoribus posticis 

 minus elongatis, subtus dente acuto armatis. Long. -34. Lake Superior. Lac. 

 150. 



D, Crassiusculae, elytrls apicem versus magis angustatis, thorace punc- 

 tate tuberculatoque, elytris valde rugosis, antennis minus attenuatis 

 articulo 3'" 2'"i paulo longiore.* 



16. D. hirticollis, obscura, thorace dense punctulato, pubescente, lateri- 

 bus bituberculatis, femoribus posticis vix unidentatis. Long. -30 -SG. Lake 

 Superior, Saratoga. Kirby, 226 ; Lac. 203. D. rudicollis. Lac. 108. Variat 

 rufa. 



17. D. di s t i n c t a, cupreo-aenea, thorace punctato, quadrato, postice sub- 

 angustato, angulis prominulis, lateribus modice tuberculatis, canaliculato, mar- 

 gineapicali basalique reflexo, elytris inlerstitiis planis, versus suturam depressis, 

 biimpressisque, lateribus sensim declivibus, apice minus truncatis, femoribus pos- 

 ticis magis clavatis, dente acuto armatis. Long. -36. Lake Superior. 



Habitus fere D. p r o x i m ae . jLec. 236. D. aqualis JKirby, 225. 



* * Elytra subparallela, apice subtruncata vel rotundata ; antennarum 

 articuli 2"*^"^ et 3'"^ suboequales ; femora postica paulo elongata ; 

 thorax Dostice angustatus. 



A. Oculi orbito distincto praediti : elytra paulo convexa. 



18. D. confusa, minus elongata, capite non toroso, thorace longiusculo 

 subtiliter rugoso, postice subangustato, angulis prominulis, canaliculato, lateribus 

 modice tuberculatis, disco versus angulos anticos profunde impresso, elytris apice 

 truncatis, striis externis profundioribus, subtiliter rugosis, versus suturam valde 

 biimpressis, femoribus posticis nigris, basirufis, dente lamellato armatis. Long. 

 27. Mass., Ohio, and Lake Superior. 



Mas, femor. post, dente maiore armatis. Variat violacea, et nigro-^nea; inter- 

 stitiis elytrorum internis saepe laevigatis. jLec. 237. 



19. D. t o r o s a, longiuscula, nigro-violacea, capite valde toroso, thorace 

 alutaeeo, parce subtiliter punctato, longiusculo, postice angustato, angulis promi- 

 nulis, lateribus tuberculatis, sub-canaliculato, elytris vix triangularibus, apice 

 rotundatim truncatis, rugosis, dorso biimpressis, femoribus posticis modice clava- 

 tis, dente minus acuto armatis. Long. -25. Mass. Dr. Harris. 



B. Oculi orbito modice distincto praediti : femora postica dente armata ; 

 corpus lincare depressura; antennce articulo 3'" longiusculo. 



20. D. a u r i f e r, senea vel laste aurea, antennis pedibusque rufis, illis fusco, 

 annulatis, capite paulo toroso, thorace longiusculo, postice angustato, ruguloso- 

 parceque punctato, angulis vix prominulis, tuberculo laterali parvo, vix prominulo, 

 vix canaliculato, ante basin profunde transversim impresso, elytris apice rotun- 

 datis, profunde punctato-striatis, rugosisque. Long. 26. Lake Superior. 



Variat thoracis disco utriuque impresso. |Lec. 237. 



This group approaches in form 'A. but the species are more convex, and the 

 tooth of the femora is not crenate. 



