2 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. C5. 



2. Mesothorax dark blue, coarsely granular (Costa Rica) sudus Vachal. 



Mesothorax green 3 



3. Mesothorax shining olive green, with scattered punctures aquilae Cockerel 1 . 



Mesothorax brassy green, closely punctured (Colorado). . olivarius, new species. 



4. Head and thorax dark blue or blue-green 5 



Head and thorax largely green; no blue tints 6 



5. Mesothorax dullish, with rather close punctures; disk of propodeum with 



plicae largely confined to the bas.il part (New Mexico) euryceps Ellis 



Mesothorax somewhat shining, more sparsely punctured; disk of propodeum 

 rugose (Massachusetts) nigroviridis Graenicher. 



6. Mesothorax rugoso-punctate (Iowa) bruneri Crawford . 



Mesothorax distinctly punctured 7 



7. Mesothorax with small close punctures; disk of propodeum with somewhat 



discontinuous rugae (Colorado) zophops Ellis. 



Mesothorax coarsely punctured (Eastern States) 8 



8. Wings clear; disk of propodeum brassy green, crescentic, plicate. 



connexus Cresson. 



(Tegulae and wings reddish) subconnexus Ellis. 



Wings not clear; tegulae dark; disk of propodeum blue, strongly rugose. 



nymphaearum Robertson. 



9. Cheeks with a large tubercle below; head large; abdomen with greenish 



luster (New Mexico) oleosus Cockerell. 



Cheeks not thus tuberculate 10 



10. Small species with punctured tegulae 11 



Tegulae not thus punctured 15 



11. Wings clear; stigma pale; head and thorax blue-green 12 



Wings somewhat dusky; head and thorax green, sometimes brassy 13 



12. Tegulae truncate posteriorly; disk of propodeum with irregularly anasto- 



mosing rugae (Illinois) tegularis Robertson. 



Tegulae pointed posteriorly; disk of propodeum granular (New Mexico). 



tegulariformis Crawford. 



13. Mesothorax green; disk of propodeum plicate (Massachusetts). 



ellisiae, new species. 

 Mesothorax often brassy or coppery; disk of propodeum not plicate 14 



14. Mesothorax brassy with purplish reflections; tegulae strongly punctured ; disk 



of propodeum long with radiating rugae perparvus Ellis. 



Mesothorax golden green; disk of propodeum short, gTanular; tegulae deli- 

 cately punctured pseudotegularis Cockerell. 



Mesothorax very dark olive green; disk of propodeum long, granular; tegulae 

 strongly punctured (California) helianthi Cockerell. 



15. Abdomen largely blue or green 16 



Abdomen red 30 



Abdomen black or brown 43 



16. Brilliant steel blue species; ^ving8 somewhat dusky; stigma dark (Illinois). 



coeruleus Robertson. 

 Not so colored 17 



17. Wings white, very clear; stigma honey color; pubescence pure white 18 



Wings not thus clear; stigma darker; pubescence dull or yellowish white 22 



18. Mesothorax blue, sparsely punctured; abdomen polished, impunctate (New 



Mexico) semicoeruleus Cockerell. 



Mesothorax golden or blue-green, more closely punctured; abdomen punc- 

 tured 19 



19. Head oval; disk of propodeum with discontinuous plicae pruinosus Robertson. 



Head normal, subcircular 20 



