314< [November, 



C. Oculi orbito valde obsoleto, vel nullo praediti ; elytra parallela con- 

 vexiuscula, vel apice rotundata, vel vix truncata : femora postica dente 

 armata. 



X' Thorax longiusculis, minus convexusj pedes mcdiocres, femoribus 

 posticis modice clavatis, basi teuuibus. 



22. D. c u p r e a, subelongata, cenea, capite modice toroso, thorace dense ru- 

 guloso, postice subangustato, angulis piominulis, late canaliculato, lateribus 

 modice tuberculatis, elytris dense ru^^osis, vix biimpressis, femoribus posticis 

 dente magno armatis, antennis annulatis articulo 3'" 4'" breviore. Long. -25 

 33. Lake Superior. Kirby 225 : Lac. 203. 



Variat ? cyanea, antennis pedibusque totis rufis. 



23. D. dives, subelongata, aenea, capite non toroso, thorace dense rugoloso 

 punctatoque, postice paulo angustato, angulis prominulis, vix canaliculato, ante 

 basin transversim impresso, lateribus subtuberculatis elytris leviter biimpressis, 

 femoribus posticis dente magno armatis, articulo antennarum 3'" tenui 4' aequali* 

 Long. '31. Lake Superior, specimen unicum. 



24. D. p u s i 1 1 a, elongata aenea, capite non toroso, thorace confertissime 

 rugoso, postice angustato, angulis anticis subprominulis, canaliculato, ante basin 

 transversim impresso, tuberculo laterali distincto, elytris dense rugosis, biim- 

 pressis, impressione anteriore obliqua, antennis crassiusculis, articulis 2 4 gra- 

 datim vix longioribus, femoribus posticis dente mediocri armatis. Long. '23 '26. 

 Lake Superior, Mass. Penn. 



Variat viridis et aurea. Say. J. Ac. 5, 293 : Lac. 199. 



25. D. emarginata, capite non toroso, thorace ruguloso, parce-punctato 

 postice paulo angustato, angulis prominulis, late canaliculato, tuberculo laterali 

 prominulo, impressione profunda separato, elytris plus minusve rugosis obsolete 

 biimpressis, femoribus posticis dente magno armatis, ano emarginato, antennarum 

 articulo S'o 41 breviore. Long. -26. Lake Superior, Mass., aad Pennsylvania. 



Mas linearis, angustus ; femina minus elongata. 



Variat aurea, cuprea, cyanea et nigra : antennis pedibusque semper obscuris. 

 Kirby 224: Lac. 202. D.hiiinfressa,^Q\s. P. Ac. 3, 159. D. aurichalcea, 

 Mels. ibid. 



26. D. m e t a 1 1 i c a, subelongata, nitida, capite non toroso, thorace rugu- 

 loso, disco utrinque laevigate, postice regulariter paulo angustato, angulis anticis 

 prominentibus, tuberculis lateralibus vix prominulis, canaliculato, ante basin 

 transversim profunde impresso, elytris rugosis, femoribus posticis dente parvo 

 armatis antennarum articulo 3' 4to vix breviore. Long. '23 -26. Penn- 

 sylvania. 



Mas antennis longioribus, femorum dente distincto: femina antennis brevioribus, 

 femorum dente obsoleto. Variat aurea, aenea, viridis et aeneo-nigra, antennis 

 plus minusve rufis. Ahrens Nov. Act. Hal. 1, 3, 33: Lac. 189. D.nana Mels.' 

 P. Ac. 3, 160. 



27. D. g e n t i 1 i s, longiuscula, nitida viridi-aenea, capite non toroso, thorace 

 ruguloso, disco utrinque Isevigato, postice magis angustato, angulis anticis promi- 

 nentibus, tuberculo laterali prominulo, canaliculato, ante basin transversim im- 



