72 Harry Scott Smith 
1892. Pemphredon inornatus Fox, Transactions of the American En- 
tomological Society, xix, p. 312. 
Eastern portion of the state. Omaha, July 17 CW Diu Pieces 
Lincoln, May 20 (L. Bruner). 
Genus Stigmus Jurine 
Stigmus americanus Packard. 
1867. Stigmus americanus Packard, Proceedings of the Entomological 
Society of Philadelphia, vi, p. 386. 
1892. Siigmus americanus Fox, Transactions of the American Ento- 
mological Society, xix, p. 322. 
Five specimens, both sexes, of this little insect were taken at 
Glen, during August, 1906 (L. Bruner, H. S. Smith). Easily 
recognized by the iarge and conspicuous stigma. 
Family CRABRONIDAE 
KEY TO THE SUBFAMILIES 
Abdomen beneath not flat but convex, and not carinate laterally; second 
discoidal cell not much longer than the first, usually shorter and not 
WELVENATEOW: tiroh Lees Horeca. Dee re ea ene CRABRONINAE 
Abdomen beneath very flat and carinate laterally, the dorsal segment with 
a constriction at the sutures and margined at apex; transverse median 
nervure in front wings uniting with the median nervure far beyond 
the origin of the basal nervure, the second discoidal cell in consequence 
being very long and narrow, much longer than the first discoidal cell; 
mandibles at apex acute, not dentate.......... ANACRABRONINAE 
‘Subfamily CRABRONINAE 
KEY TO THE GENERA 
Abdomen petiolate, or with the first segment petioliform and nodose 
at apex; first recurrent nervure received at the middle of the first 
enbital? cell owe Pskae veg et eaes kee Bh pelea eer Cena Rhopalum 
Abdomen not petiolate, or witi: the first segment petioliform and no- 
dose at apex; first recurrent nervure received at or beyond the 
middle of the first cubital cell. 
Mandibles at apex bi- or tridentate, sometimes indistinctly so, but 
MEVET BCUbG CL i 6 bac dpleae > Bue Bae Ue aa ee Das ee ae Crabro 
Mandibles at apex simple, acute; first recurrent nervure received by 
the ‘first.-cubital cell vats the: middle: 5 <;. 9258 oe wae oe nccten Lindenius 
Ww 
Ne) 
4= 
