Sphecoidea of Nebraska 131 
this variation occurs in nine specimens with no two alike. One 
of these might possibly be placed as dakotensis Banks. The 
males also vary considerably in the distribution of yellow on the 
first abdominal segment and metanotum, and to some extent in 
the sculpture of the enclosed space. However, in this series of 
51 males there does not seem to be any constant variation or any 
structural character by which they might be grouped and cor- 
related with the females. Further collecting and study may show 
these to be distinct species, but from the material at hand it 
would appear that this is a wide ranging and quite variable 
species. 
Cerceris deserta Say. 
1824. Cerceris deserta Say, Long’s Exped., II, App., p. 344. 
1912. Cerceris deserta Banks, Ann, Ent. Soc. Amer., V, p. 18. 
Males 1: Mitchell, September 5, 1916 (R. W. Dawson). 
Cerceris gnara Cresson. 
1872. Cerceris gnara Cresson, Trans. Amer. Ent. Soc., IV, p. 229. 
1912. Cerceris gnara Banks, Ann. Ent. Eoc. Amer., V, p. 22. 
Males 19, females 24: Rulo (2), South Bend (5), Curtis (1), 
Bridgeport (2), Mitchell (32) and Monroe Canyon (1) ; June 23 
to August 7; visits flowers of Melilotus alba and Ceanothus 
americanus. 
Cerceris alceste Mickel. 
1918. Cerceris alceste Mickel, Univ. Nese. Stupies, XVII, p. 333. 
Female 1: Mitchell, August 24, 1916 (C. E. Mickel). 
Cerceris occipitomaculata Packard. 
1866. Cerceris occipitomaculata Packard, Proc. Ent. Soc. Phil., V1, 
p. 62. 
1908. Cerceris occipitomaculata H. S. Smith, Univ. Nesr. STupIEs, 
VIII, p. 368. 
Males 13: Omaha (7), Lincoln (3), Fairmont (1) and Glen 
(1); August 9 to September 14; visits flowers of Solidago ‘cana- 
densis. 
Cerceris imitatoria Schletterer. 
1865. Cerceris imitator Cresson, Proc. Ent. Soc. Phil., V, p. 125 (nec. 
F. Smith). 
449 
