100 Clarence E. Mickel 
Males 5: Omaha (4) and Mitchell (1); July 16 to August 14; 
visits flowers of Chamaecrista fasciculata and Melilotus alba. 
Tachytes parvus Fox. 
1892. Tachytes parvus Fox, Trans. Amer. Ent. Soc., XIX, p. 249. 
1893. Tachytes parvus Fox, Proc. Acad. Nat. Sc. Phil., p. 504. 
Males 1: Omaha, August 13, 1to14- (CL. 7. Withams);- og 
Chamaecrista fasciculata. 
Tachytes minor Rohwer. 
1909. Tachytes minor Rohwer, Trans. Amer. Ent. Soc., XXXV, p. 
127, 
Males 4: Omaha (4); July 14 to August 26; visits flowers of 
Chamaecrista fasciculata. 
Tachytes minutus Rohwer. 
1909. Tachytes minutus Rohwer, Trans. Amer. Ent. Soc., XXXV, 
p. 128. 
Males 2: Omaha, August 13 and 18, 1914 (L. T. Williams). 
Tachytes maestus Mickel. 
1916. Tachytes maestus Mickel, Trans. Amer. Ent. Soc., XLII, p. 417. 
Females 6: Omaha (6) ; July 31 to August 25. 
Tachytes obductus Fox. 
1892. Tachytes obductus Fox, Trans. Amer. Ent. Soc., XIX, p. 250. 
1913. Tachytes obductus Williams, Kans. Univ. Sc. Bull., VIII, p. 
A 153. 
Females 5: Omaha (4) and Ashland (1) ; July 23 to August 5. 
Tachytes mergus Fox. 
1892. Tachytes mergus Fox, Trans. Amer. Ent. Soc., XIX, p. 250. 
1913. Tachytes mergus Williams, Kans. Univ. Sc. Bull., VIII, p. 157. 
Females 8: Omaha (8) ; July 12 to August 12; visits flowers 
of Chamaecrista fasciculata. 
Tachysphex Kohl 
KEY TO THE SPECIES 
Females 
1. Interocular space at vertex always distinctly more than one half the 
interocular space at the lower edge of the eyes; face with long pile; 
418 
