13. 
to 
Sphecoidea of Nebraska 55 
Head and abdomen rather finely punctured; mesonotum with the punc- 
tures close and not very coarse; propodeum not spotted; tibiae with 
a black spot within; basal half of femora usually black ....dilectus 
Head and abdomen, particularly the first tergite, rather coarsely punc- 
tured; mesonotum coarsely cribrose; femora more or less reddish, 
rufifemur 
Males 
. Anterior margin of clypeus produced into a strong, truncated process, 
not so prominently, however, as in the females ...............- 2 
Anterior margin of clypeus not! strongly produced medially, usually 
HOUSE T I Ae o SAR aE OORT DORIA CHIE CEH Be ROTC REID Paiste TSE" 6 
. Flagellum entire, not dentate or emarginate, not broadened basally; 
sculpture very coarse on head and thorax; first joint of medial tarsi 
Sinneted store tarsi slightly flattemed <n. 2iishck..se «5 2s 0 svi ere ore 3 
First three or four joints of flagellum produced into a huge tooth be- 
neath; ocelli forming an equilateral triangle; pronotum rounded at 
HELE SIC eS il OtA MEN tales, Aa Ne ches. cele relorcce nie Site slere e baebelee Setatarard ciate yale 5 
. First dorsal abdominal segment basally much flattened, the flattened 
area bounded posteriorly by an obtuse elevation; second dorsal ab- 
dominal segment strongly depressed. basally ............... planaris 
First two dorsal abdominal segments normal, not conspicuously flat- 
LEO Or eA CPhESSEGS spe esi teres crate chebeia scat ainrectr ete Caoaeresele Sarit eaves 4 
. Head between the ocelli and occiput covered with very large, deep, 
non-confluent punctures, those on the abdomen also strong, but less 
so than on the head; abdomen with one, more rarely with two or 
thie etenimimal dard Sy. ame esina cies tectavere eucleecormente stehtiarsietele interruptus 
Head between the ocelli and occiput with coarse, confluent punctures, 
less strong than in interruptus, those on the abdomen also finer and 
closer; abdomen with three, rarely with less, terminal bands. .bellus 
. Joints one and two of flagellum with a huge tooth or production be- 
neath, the third and fourth joints much less distinctly toothed, the 
combined length of the first two joints as great as that of joints 
three to six; fore femora black and yellow; sides of propodeum 
OAESEIVG SSEELACER) vice atte Se eke eleret Meare et eee ee tere ees. obscurus 
Joints one to four of flagellum equally dentate beneath, the combined 
length of the first two joints not greater than that of joints three © 
and four; fore femora rufous, striped with black and yellow, 
nigrifrons 
. Mesonotum not striated, either finely or rugosely punctured ...... 7 
Mesonotum striated, transversely on anterior portion, posteriorly longi- 
tudinally so (fore femora beneath armed with a sharp spine) .. 15 
. Abdomen above not distinctly punctured, or impunctate; first joint of 
the flagellum distinctly longer than the second; fore femora reddish 
AMTECT AO LLY A: iaceceys sheen atone Set ese nkodd OIC reNSTT lar teuk oD Neng) ole APRA sayt 
