124 Clarence E. Mickel 
Females 12: Mitchell (5), Glen (5), Monroe Canyon (1) and 
Warbonnet Canyon (1); July 11 to August 14; visits flowers of 
Petalostemum sp. and Medicago sativa. 
Bembix pruinosa Fox. 
1895. Bembex pruinosa Fox, Proc. Acad. Nat. Sc. Phil., p. 361. 
Males 6, females 11: Child’s Point (1), Omaha (6), Louis- 
ville (2) and South Bend (1); July 2 to September 3; visits 
flowers of Solidago canadensis, Asclepias verticillata and Meli- 
lotus alba, 
Microbembex Patton 
Microbembex monodonta Say. 
1824. Bembex monodonta Say, Long’s Exped., II, App., p. 355. 
1895. Microbembex monodonta Say, Proc. Acad. Nat. Sc. Phil., p. 
63. 
1908. Se ar monodonta Johnson and Rohwer, Ent. News, 
XIX, p. 374. 
Males 23, females 51: Omaha (15), Louisville (5), South 
Bend (13), Ashland (27), Lincoln (2), Cedar Bluffs (1), West 
Point (2), Neligh (3), Haigler (1), Halsey (1), Mitchell (3) 
and Gordon Creek (1); June 13 to September 30; visits flowers 
of Melilotus alba, Solidago glaberrima, Vernonia fasciculata, 
Medicago sativa, Verbena stricta, Asclepias syriaca, Asclepias 
sullivanti and Aster salicifolius. 
CERCERIDAE 
KEY TO THE GENERA 
Third cubital cell not quadrate, the third transverse cubital vein oblique, 
joining the radial cell much before the apex; second cubital cell petio- 
late; abdominal tergites 2-6 without a median transverse furrow or im- 
pression, but usually margined at the apex .<.....o..%..< cm < ss Cerceris 
Third cubital cell quadrate, the third transverse cubital vein joining the 
radial cell at the apex; second cubital cell petiolate in the female, not 
petiolate in the male; abdominal tergites 2-4 in male, 2-6 in female, with 
a median transverse furrow or impression ................-- Eucerceris 
442 
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