50 BULLETIN- 143, UNITED STATES NATIOISrAL MUSEUM 



71. Apical half of second abdominal tergite with two large, round, confluent pale 



yellow spots; punctures of this latter area large, separated, those of the 

 remainder of the disk moderate and dense ; apical fringe of third tergite 

 black, interrupted medially by a spot of silvery pubescence. 



paenulata (p. 206). 

 Apical half of second tergite somewhat paler than remainder of tergite, but 

 puncturation not different; pubescence of third tergite entirely silvery. 



caneo (p. 203). 



72. Genae as coarsely sculptured as the front and vertex 73. 



Genae not nearly as coarsely sculptured as the front and vertex 80. 



73. Posterior margin of genae carinate or subcarinate 74. 



Posterior margin of genae rounded 79. 



74. Posterior margin of genae strongly carinate ; abdominal sternites with 



an apical fringe of pale or red hairs 75. 



Posterior margin of genae only subcarinate; abdominal steniites for the 

 most part fringed with black hairs 77. 



75. Abdomen above clothed with dense, very long, shaggy pubescence ; pubescence 



of first abdominal tergite black 76. 



Abdomen above very sparsely clothed with erect black pubescence ; second 

 tergite with a pair of basal lateral spots of white recumbent hairs and a 

 thick apical fringe of white hairs; pubescence of first abdominal tergite 

 white sicheliana (p. 246) . 



76. Pubescence of head, thorax, and legs black, of abdomen red. 



magnifica (p. 234). 



Pubescence of head, thorax, and portions of the legs whitish, of abdomen 



pale yellow magna (p. 232). 



77. Head and thorax with black pubescence 78. 



Head and thorax with yellowish pubescence calorata (p. 227). 



78. Abdomen (except first segment) entirely clothed above with erect, red hairs. 



klugii (p. 229). 



First segment, base, and apex of second abdominal tergite, third tergite and 



base of fourth tergite medially with black hairs ; remainder of abdomen 



with red hairs clotho (p. 231). 



79. Second abdominal tergite with the punctures small and more or less conflu- 



ent ; dorsum of propodeum with red to yellowish pubescence. 



occidentalis (p. 221). 

 Second abdominal tergite with the punctures very large and separated, 

 almost foveate ; dorsum of propodeum with black pubescence. 



occidentalis var. comanche (p. 225). 



80. Pubescence of abdominal tergites 3-5 concolorous with that of tergite 2—81. 

 Pubescence of abdominal tergites 3-5 not concolorous with that of tergite 



2 82. 



81. Sternites 2-5 with a thick apical fringe of pale pubescence__satanas (p. 239). 

 Sternites 2-5 with the apical fringe of pubescence black, at least medially. 



sackenii (p. 237). 



82. Apical fringes of abdominal sternites silvery ; abdominal tergites 3-5 with 



silvery pubescence at least laterally ursula (p. 143). 



Abdomen beneath entirely black; tergites 3-5 almost entirely black 

 pubescent 83. 



83. Pygidium distinctly longitudinally striate; pubescence of thorax and abdo- 



men mostly sparse and recumbent medea (p. 143). 



Pygidium either irregularly or longitudinally rugose ; pubescence of thorax 

 and abdomen mostly dense and erect 84. 



