10. 
a 
12. 
rz 
Sphecoidea of Nebraska 125 
Cerceris Latreille: 
KEY TO THE SPECIES 
Females 
. Clypeus with an elevation or process with a free apical edge ...... 2 
Clypeus without such elevation, although more or less swollen .... 25 
. The clypeal process erect, and as long or longer than broad ....... 3 
The clypeal process much broader than long, or not erect ......... 5 
. Clypeal process deeply, roundly emarginate, the apica lateral angles 
appearing as long teeth; vertex red clear across ............ alceste 
Clypeal process entire; head black and yellow ................000: 4 
. Enclosure of propodeum more or less smooth or longitudinally striate, 
very narrow yellow bands on tergites three, four and five ..clypeata 
Enclosure of propodeum obliquely striate at the sides, no yellow bands 
OUMLELOITeS Linee: LOG eanlCetiwe eels. «sc faa dlel «s:deeicra sre ents gnara 
. First, and often second abdominal segments mostly reddish ....... 6 
Pics: a pCominal Semi elit: Ik Chom tals 24s fats « vies o's lee. eee be pieecheroee 13 
. Enclosure of propodeum either transversely or longitudinally striated. 7 
Enclosure of propodeum smooth or punctate at the sides .......... II 
. Enclosure of propodeum transversely striated; mesepisterna with a 
spine before the intermediate coxae; propodeum red ........... 8 
Enclosure of propodeum longitudinally striate; mesepisterna not 
SMa eM RPLOPOC einen ObRheGar tite Sens \cc ceca alsialoale ctvercice cae Strate 9 
. First two segments of abdomen largely red; clypeus very strongly bi- 
dentate at the apex; markings whitish .........0.cece0s6- conifrons 
Onivithe first seement of abdomen ned. i. sc. ccs le vccceesdacues 10 
. Pygidial area narrowed and rounded at the apex; clypeal projection 
HaLrowervatathertip: tam at tae base... % chi vtlels soled ts cheese argia 
Pygidial area narrowed and distinctly truncate at the apex; clypeal 
projection in the form of a transverse ridge ..............+.-- echo 
Yellow abdominal bands broad, occupying the tergites almost entirely; 
projection of clypeus narrower apically than at base ........ vicina 
Yellow abdominal bands narrow, occupying about one fourth of ter- 
gites; projection of clypeus as broad at apex as at base, quite deeply 
RCCL MG Mes ORNS alone Manors foes eiaue™y Staiatece wi eke: «iene.t oreiatn eter tare nebrascensis 
Givocal process entre or quadrate <1. 2. 66.5 ced ok ws we wt wa ore alacris 
Clypeal process deeply emarginate, appearing lunate .............. 12 
Lateral angles of clypeal process not much elevated; abdomen yellow- 
ish only on basal segments; wings dark ...............6. bicornuta 
Lateral angles of clypeal process high; insect almost entirely yellowish, 
frontata 
From the tip of the clypeal process, which is not much elevate, hangs 
a thin lamella usually divided in the middle .................... 14 
IOMSTIG HEN AITellaT PLEGEIL vale rh ratdctecc sjouBeteotertie va clweeeisie tial ots aWier cues 17 
