132 Clarence E. Mickel 
1887. Cerceris imitatoria Schletterer, Zoologische Jahrbucher, II, p. 
494. 
1908. Cerceris imitatoria H. S. Smith, Univ. Nese. Stupies, VIII, 
p. 367. 
1912. Cerceris imitatoria Banks, Ann, Ent. Soc. Amer., v, p. 20. 
Males 7, females 1: Rulo (1), Omaha (1), South Bend (1), 
Lincoln (1), West Point (1) and Sioux county (2) ; June 17 to 
August ; visits flowers of Ceanothus americanus. 
Cerceris nigrescens F. Smith. 
1856. Cerceris nigrescens F. Smith, Cat. Hym. Brit. Mus., IV, p. 466. 
1912. Cerceris nigrescens Banks, Ann. Ent. Soc. Amer., V, p. 20. 
Males 2, females 2: West Point (2), Mitchell (2); June to 
July 20; visits flowers of Cirsium sp. 
Cerceris sexta Say. 
1837. Cerceris sexta Say, Bost. Journ. Nat. Hist., I, Pt. 4, p. 382. 
1865. Cerceris Sexta Cresson, Proc. Ent. Soc. Phil., V, p. 119. 
Males 1: West Point. 
Cerceris architis Mickel. 
1916. Cerceris architis Mickel, Trans. Amer. Ent. Soc., XLII, p. 409. 
Females 1: South Bend, July 2, 1915 (E. G. Anderson) ; on 
Melilotus alba. 
Cerceris arbuscula Mickel. 
1916. Cerceris arbuscula Mickel, Trans. Amer. Ent. Soc., XLII, p. 
410. 
Females 1: Omaha, July 23, 1913 (L. T. Williams). 
Cerceris vicina Cresson. 
1865. Cerceris vicina Cresson, Proc. Ent. Soc. Phil., V, p. 120. 
1908. Cerceris vicina H. S. Smith, Univ. Nesr. Stunies, VIII, p. 367. 
Males 10, females 11: Mitchell (17), Glen (3) and Bad Lands 
(1); July 13 to August 15; visits flowers of Medicago sativa, 
Melilotus alba, Heliaftthus sp., and Petalostemum sp. 
Cerceris conifrons Mickel. 
1916.. Cerceris conifrons Mickel, Trans. Amer. Ent. Soc., XLII, p. 
410. 
Females 6: Neligh (1), Mitchell (2), Glen (1) and Harrison 
(2) ; August; visits flowers of Helianthus sp. and Melilotus alba. 
450 
