114 Clarence E. Mickel 
Plenoculus apicalis Williams. 
1913. Plenoculus apicalis Williams, Kans. Univ. Sc. Bull., VIII, p. 175. 
Males 1: Mitchell, September 9, 1915 (E. M. Partridge). 
Niteliopsis Saunders 
Niteliopsis plenoculoides Fox. 
1893. Niteliopsis plenoculoides Fox, Psyche, VI, p. 555. 
1909. Niteliopsis plenoculoides Rohwer, Trans. Amer. Ent. Soc., 
SOXOG Vs (abi. 
Males 1, females 2: Sowbelly Canyon (3), June 23, 1911 (R. 
W. Dawson). 
Bothynostethus Kohl 
Bothynostethus distinctus (Fox). 
1891. Nysson distinctus Fox, Ent. News, II, p. 31. 
1893. Bothynostethus distinctus Fox, Proc. Acad. Nat. Sc. Phil., p. 551. 
1913. Bothynostethus distinctus Williams, Kans. Univ. Sci. Bull., 
VIII, p. 179. 
Females 1: Omaha, July 16, 1914 (L. T. Williams), on 
Chamaecrista fasciculata. 
BEMBICIDAE 
KEY TO THE SUBFAMILIES 
Labrum small, very much shorter than the dorso-ventral length of clypeus; 
intermediate tibiae with two apical spiirs 2.) /- )o. wens enn eee Stizinae 
Labrum very large, often longer than the dorso-ventral length of the 
clypeus; intermediate tibiae with one apical spur ........... Bembicinae 
STIZINAE 
KEY TO THE GENERA 
Marginal cell about twice as long as first cubital; spurs of hind tibiae en- 
larged in the female, and the pygidium well developed; abdomen of the 
male with, a sitielé spine lat apex... seo wteems seme teen it .Sphecius 
Marginal cell much shorter than the first cubital; spurs of hind tibiae 
short in both sexes, not enlarged; no pygidium; at the most with two 
short ridges on each side of the apical portion of last’ abdominal seg- 
ment; abdomen of the male with three spines at apex ........... Stisus 
432 
