8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



5. Wings faintly reddish; face color of mesothorax (Colorado). 



paulolus, new species. 

 Wings clear; stigma and nervures testaceous; face olive green (Guatemala). 



pseudotegularis Cockerell. 



6. Abdomen blue or green 7 



Abdomen not blue or green 11 



7. Larger; golden green ; pubescence ochraceous; wings yellowish (Massachusetts ), 



pilosus Smith. 

 Smaller; blue; pubescence pure white; wings very clear 8 



8. Head broader than long; disk of propodeum with a semicircular inclosing rim. 



(New Mexico) exalbidus, new species. 



Head not so; disk of propodeum not so inclosed 9 



9. Hoary with very dense white pubescence; disk of propodeum brilliant blue, 



plicate pruinosiformis Crawford. 



Not so 10 



10. Disk of propodeum with irregularly wrinkled rugae; first recurrent nervure 



joining second trans verso-cubital (New Mexico) albohirtus Crawford 



Disk of propodeum polished, obscurely sculptured; second submarginal cell 

 receiving first recurrent nervure a little distance from the apex (Colorado). 



actuarius, new species. 



11. Abdomen red, suffused with blackish; head and thorax green; disk of pro- 



podeum plicate (Illinois) zephyrus Smith. 



Abdomen black or dark brown 12 



12. Clypeus entirely yellow, or at least the lower half yellow 13 



Clypeus not yellow, or the anterior margin obscurely yellowish 18 



13. Head and thorax olive green; flagellum dark (Colorado) sagax, new species. 



Head and thorax blue-green or blue; flagellum pale beneath 14 



14. Tegulae very pale; legs largely yellow 15 



Tegulae dark; legs largely dark 16 



15. Mesothorax somewhat brassy; abdomen punctured (New Mexico). 



hyalinus Cra^vfo^d. 



Mesothorax blue-green; abdomen not punctured (New Mexico). 



perexiguus, new species. 



16. Mesothorax delicately punctured; mandibles yellow (Colorado). 



occultus, new species. 

 Mesothorax closely punctured ; mandibles dark (Colorado) 17 



17. Head and thorax blue-gi'een; disk of propodeum subcrescentic. 



evestigatus, new species. 

 Head and thorax blue; disk of propodeum longer, brilliant blue. 



pikei, new species. 



18. Tegulae and stigma dark; wings dusky; usually larger species, except 



insulus and obnubilus 19 



Tegulae and wings pale; or if tegulae reddened, then wings paler; usually 



small species, except nymphaearum, connexus, and albipennis 29 



19. Small species, less than 5 mm. long 20 



Larger species 21 



20. Mesothorax blue-green; disk of propodeum plicate (Colorado). 



obnubilus, new species. 

 Mesothorax blue; disk of propodeum plicate on base only (New Mexico). 



insulsus, new species. 



21. Head and thorax brassy olive green; disk of propodeum rugose. 



oblongus Lovell. 

 Head and thorax blue or green, not brassy 22 



22. Sculpturing confined to disk of propodeum 23 



Sculpturing not confined to disk of propodeum 24 



