AKT. 19. AMERICAN BEES OF THE GENUS HALICTUS SANDHOUSE. 7 



83. Larger; pubescence yellowish; legs brown; abdomen brownish, apical mar- 



gins of segments broadly testaceous floridanus Robertson. 



Smaller; pubescence dull white; legs and abdomen black, .ashmeadii Robertson. 



84. Disk of propodeum shining, microscopically tessellate between discontinu- 



ous plicae versatus Robertson. 



Disk of propodeum dull, with irregular, wrinkled rugae (New Mexico). 



comis, new species. 



85. Tegulae somewhat reddened (Mountain States) 86 



Tegulae pale testaceous 89 



86. Smaller, slender species; plicae confined to base of disk of propodeum 87 



Larger, robust species; head broad; plicae reaching the apex of the disk of 



propodeum 88 



87. Disk of propodeum blue, shining, with few plicae meritus, new species. 



Disk of propodeum green; plicate at sides of disk; somewhat anastomosing 



rugae on median part of disk arcanus, new species. 



88. Disk of propodeum crescentic latus, new species. 



Disk of propodeum longer; plicae weak on median part of disk. 



phaceliarum Cockerell. 



89. Mesothorax and scutellum polished, dark, very sparsely punctured; disk of 



propodeum plicate on base only; flagellum ferruginous; mandibles clear 



red (Guatemala) tropicior Ellis. 



Not so; mesothorax blue-green, or lighter green 90 



90. Head broad; robust species; disk of propodeum plicate (Iowa). 



unicus, new species. 

 Head normal or narrow; more slender species 91 



91. Abdomen brownish, slender, with quite abundant white hair; disk of propo- 



deum finely granular with few weak plicae (New Mexico) oblongus Lovell. 



Abdomen black, broader, first two segments without pubescence 92 



92. Legs entirely black; disk of propodeum microscopically tessellate between 



rugae 93 



Knees and tarsi reddened 94 



93. Abdomen sparsely pubescent (Maine) oblongus planatus Lovell. 



Abdomen with subappressed hair (Nebraska) politissimus Cockerell. 



94. Disk of propodeum plicate (Colorado) absimilis, new species. 



Disk of propodeum weakly rugulose on base only (Iowa). 



vintonensis, new species. 



KEY TO MALES OF HALICTUS (CHLOBALICTUS). < 



Legs entirely red; under side of abdomen red aquilae Cockerell. 



Legs not entirely red; under side of abdomen not red; or if reddish, then upper 



side also reddish 1 



1. Thorax and abdomen testaceous bruesi Cockerell. 



Thorax not testaceous 2 



2. Small species with punctured tegulae 3 



Tegulae not punctured 6 



3. Mesothorax steel blue; flagellum pale beneath 4 



Mesothorax dark blue or greenish blue; flagellum little paler beneath 5 



4. Disk of propodeum brilliant blue, crescentic, plicate; flagellum yellow- 



testaceous beneath (California) gaudialis, new species. 



Disk of propodeum color of mesothorax, longer, rugose; flagellum chrome- 

 orange beneath (New Mexico) tegulariformis Crawford. 



^ See second paragraph of introduction for statement of species included in this key. 



