ART. 19. AMERICAN BEES OF THE GENUS HALICTUS SANDHOUSE 3 



20. Apex of flagellum ferruginous; meso thorax opaque, closely punctured; disk 



of propodeum with irregularly anastomosing rugae (New Mexico). 



microlepoides Ellis. 

 Flagellum not ferruginous; mesothorax polished, coarsely punctured 21 



21. Disk of propodeum brilliant blue, rugose pruinosiformis Crawford. 



Disk of propodeum color of mesothorax, rugulose (Colorado). 



glaucovirens Cockerell. 



22. Mesothorax very closely punctured with both coarse and finer punctures; disk 



of propodeum plicate (California) diversopunctatus Ellis, 



Mesothorax not thus punctured 23 



23. Head narrow; orbits almost parallel; flagellum yellow-testaceous beneath 



(Colorado) pavoninus Ellis. 



Head normal, subcircular; orbits converging 24 



24. Tegulae dark; dark blue-green species 25 



Tegulae light; lighter species 26 



25. Abdomen obovate; disk of propodeum shining, plicate (Colorado). 



sedi. new species. 

 Abdomen more slender; disk of propodeum brilliant blue, with irregularly 

 anastomosing rugae ( New Mexico) veganus Cockerell. 



26. Wings and tegulae reddish; mesothorax opaque, very closely punctured; disk 



of propodeum granular (Colorado) lazulis Ellis. 



Wings and tegulae not reddened 27 



27. Mesothorax polished olive green, delicately pimctured; disk of propodeum 



long, plicae confined to basal part (Colorado) academicus, new species. 



Mesothorax golden green, closely punctured 28 



28. Head comparatively broad; disk of propodeum granular; pubescence yel- 



lowish; flagellum yellow-testaceous beneath (California). 



actinosus, new species. 

 Head normal 29 



29. (These seem to be very closely related.) 



Flagellum dusky ferruginous at apex; disk of propodeum microscopically 



tessellate between anastomosing rugae (Illinois) pilosus Smith. 



Species little smaller: 



Flagellum clear ferruginous at apex; scutellum golden green (Colorado) 



succinipennis Ellis. 

 Scutellum color of mesothorax; disk of propodeum longer than in the two 

 preceding species, polished at the apex (Maine). 



pilosus leucocomus Lovell. 



30. Abdomen dusky red 31 



Abdomen clear red or orange-red 35 



31. Larger, 6-7 mm. long 32 



Smaller, less than 5 mm. long 33 



32. Wings faintly dusky; head and thorax olive green, very closely punctured 



(California) petrellus Cockerell. 



Wings very clear; head and thorax shining blue-green, more sparsely punc- 

 tured (New Mexico) eophilus Ellis. 



33. Head and thorax blue-green; flagellum ferruginous, paler beneath. 



stultus Cresson- 

 Head and thorax olive green; flagellum dark 34 



34. Abdomen largely dark and submetallic; the light parts orange-ferruginous 



(Florida) nymphalis Smith. 



Abdomen chestnut red, a little greenish on middle of third segment (Ne- 

 braska) plctus Crawford. 



