80 Clarence E. Mickel 
cord (8), West Point (10), Fairmont (24), Maxwell (3), Broken 
Bow (1), Holt county (3), Curtis (1), McCook (1), Lexington 
(1), Imperial (4), Mitchell (37), Chadron (1), Haigler (2), 
Dundy county (3), Harrison (2), Glen (17), Pine Ridge (2), 
Warbonnet Canyon (1) and Sioux county (1); June 17 to Oc- 
tober 10; visits flowers of Petalostemum purpureum, Asclepias 
incarnata, Asclepias verticillata, Solidago glaberrima, Asclepias 
tuberosa, Chamaecrista fasciculata, Petalostemum candidum, 
Amorpha canescens, Ceanothus americanus, Euphorbia emargi- 
nata, Cleome serrulata and Solidago rigida. 
Chlorion thomae (Fabricius). 
1775. Sphex thomae Fabricius, Ent. Syst., p. 346. 
1906. Chlorion (Priononyx) thomae Fernald, Proc. U. S. Nat. Mus., 
XXXI, p. 342. 
Males 6, females 16: Lincoln (1), Imperial (1), Gering (1), 
Mitchell (14), Agate (1), Monroe Canyon (4) and Glen (1); 
June 24 to September 10; visits flowers of Petalostemum violaceus 
and Melilotus alba. 
Chlorion bifoveolatum (Taschenberg). 
1869. Priononyx bifoveolata Taschenberg, Zeitschrift fur aes. Natur- 
wissenschaft, XXXIV, p. 408. 
1906. Chlorion (Priononyx) bifoveolatum Fernald, Proc. U. S. Nat. 
Mus., XXXI, p: 346. 
Males 1, females 2: Mitchell (1), Monroe Canyon (1) and 
Sioux county (1); July 27 to August 6; visits flowers of Mehi- 
lotus alba. 
Chlorion aztecum cinereum (Fernald). 
1903. Jsodontia macrocephala cinerea Fernald, Can. Ent., XXXV, p. 
27%, 
1906. Chlorion (Isodontia) aztecum cinereum Fernald, Proc. U. S. 
Nat. Mus., XXXI, p. 356. 
Females 2: Omaha (2) ; August 5 and August 17 (L. T. Wil- 
liams). 
Chlorion harrisi Fernald. 
1856. Sphex apicalis F. Smith, Cat. Hym. Brit. Mus., IV, p. 262. 
1906. Chlorion (Isodontia) harrisi Fernald, Proc. U. S. Nat. Mus., 
XXXI, p. 350. 
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