Studies of North American Bees 5 



Genus Stelis Panzer, 1802 



KEY TO THE NEBRASKA SUBGENERA 



Second recurrent nervure received opposite or beyond the second trans- 

 verse cubital nervure, rarely before it Microstelis 



(Type Stelis lateralis Cresson) 

 Second recurrent nervure received by the second submarginal cell before 



the second transverse cubital nervure, rarely opposite it Chelynia 



(Type Stelis nitida Cresson) 



Subgenus Microstelis Robertson, 1903 



KEY TO THE NEBRASKA SPECIES 



Female 



Abdomen 8-14 spotted, on tergites i-S ; color black ; pubescence whitish ; 

 6-7 mm lateralis 



Male 

 Abdominal tergites l-S w^ith lateral whitish spots, 4 and 5 sometimes 

 4 spotted, elsewhere wholly black ; 5.5-6 mm lateralis 



Stelis (Microstelis) lateralis Cresson. 



1864. Stelis lateralis Cresson, Proc. Ent. Soc. Phil., II, pp. 410-41 1, ?. 

 1898. Stelis lateralis Robertson, Trans. Acad. Sci. St. Louis, VIII, p. 



48, c? 5. 

 1898. Stelis lateralis Cockerell, The Entomologist, p. 167. 

 1903. Microstelis lateralis Robertson, Trans. Am. Ent. Sac, XXIX, p. 

 175, ? c^. 



Three females of this species were bred from a nest of Alci- 

 damea simplex in a stem of Helianthus annuus collected at 

 Lincoln, emerging in June along with three females of the host 

 bee. Mr. J. C. Crawford collected this bee at the nest of the 

 same host in rose bushes at West Point, Nebraska, June 10, 1901. 

 The only occasion it has been collected in the field was at South 

 Bend, May 18, 191 1, when the writer captured a male at flowers 

 of Erigeron philadelphicus. 



Subgenus Chelynia Provancher, 1888 



KEY TO THE NEBRASKA SPECIES 



Female 

 Greenish blue; abdomen with four pale yellowish white bands; hair of 



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