The Sphegoidea of Nebraska 15 
A single female from Glen, August 13, 1906 (H. S. Smith). 
In this specimen the apical half of the wings is very dark, the 
~ basal half hyaline. 
Astatus nevadicus Cresson. 
1881. Astata nevadica Cresson, Transactions of the American Ento- 
mological Society, ix, p. v. 
1893. Astatus nevadicus Fox, Proceedings of the Academy of Natural 
Sciences of Philadelphia, p. 540. 
Two females from Glen, August 20, 1906 (P. R. Jones, H. S. 
Smith). 
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Genus Diploplectron Fox 
Diploplectron ferrugineus Ashmead. 
1899. Diploplectron ferrugineus Ashmead, Entomological News, aoe 
99. 
Two specimens of this interesting and rare little insect were 
taken at Glen, on August 14 and 28, 1906 (L. Bruner, P. R. 
Jones). Neither of the specimens has the wings clouded or the 
apical segments black, as described by Dr. Ashmead, and one 
specimen has no black coloring whatever. It may prove to be a 
distinct species, but these characters are quite variable in this 
subfamily. 
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Subfamily NYSSONINAE 
KEY TO THE GENERA 
Cubitus in hind wings originating beyond the transverse median 
nervure. 
Hind tibiae strongly serrated on the hind margin, and also more or 
less spinous; lateral margins of scutellum more or less strongly 
‘reflexed, the postscutellum bilobed; apex of male abdomen termi- 
TAPIA Camt ee POLE CECT carn -b.c cl aciefe ace ick e%a tess stele cfve tans scree cielo s Paranysson 
Hind tibiae with feeble spines, never serrate; lateral margins of 
scutellum more or less margined, the postscutellum normal; apex 
of abdomen of male terminating in two teeth............ Brachystegus 
Cubitus in hind wings originating before the transverse median nerv- 
ure or interstitial with it: hind tibiae usually spinous, but not ser- 
rate on hind margin; scutellum normal; apex of abdomen of 
male: termine an, two. teeth.c. . ....4 Mees vs ocagudlewae bacco Nysson 
S57 
