Sphecoidea of Nebraska a0 
Nysson Latreille 
KEY TO THE SPECIES 
MEE CEN Ces xk RE ety Shoe nha WE Sie Ce wis CEL ews Gan BEG inlet hie A 2 
RMR Stee ts AOR since A eich ates Kms cpa Ee oes awe sox tei 5 
. Basal segment of abdomen red; size small, 5-6 mm. long ...rufiventris 
PMC en Otwa tw llMGEC Maer Sd tuysars tte cele ors Sica oe Becle tale oie pee 3 
. Scutellum not margined laterally, but strongly and closely punctured; 
puncturation of head and mesonotum very close; spots on first 
abdominal segment same size as those on remaining segments, 
fidelis 
Scutellum faintly margined laterally, covered with large, sparse, shallow 
punctures; spots on the first abdominal segment the largest ..... 4 
. Pygidial areas broad, subtruncate at tip, with large somewhat confluent 
punctures; spots on first abdominal segment almost covering the 
entire Segment: size large, TI—13) Mil. %.... ese ook ee oo oe plagiatus 
Pygidial area narrower, rounded at tip, longitudinally rugoso-punctate ; 
spots on first abdominal segment transverse, confined to apical por- 
POT “SERLELE Skis oe ente nig itive ea wa Male mers dojo Biche hain’s aequalis 
. Last dorsal segment ciliated between the teeth .............0......- 6 
Last dorsal segment not ciliated between the teeth, length 5-6 mm. 8 
. Last dorsal segment not prominent between the teeth, subtruncate; lat- 
eral spots on the first dorsal segment large, covering almost the 
HEM CM SRATEIEIE ret tare betas cic au ie aeerene reyes raratee her nm etree plagiatus 
Last dorsal segments prominently angulate between the teeth; spots on 
the first segment transverse, confined to apical portion of segment 7 
. Size large, 10-11 mm.; tubercles, pronotum and scutellum yellow, scape 
and femora entirely ferruginous; ventral punctures deep ...aequalis 
Size smaller, 7-8 mm.; tubercles, pronotum and scutellum without yel- 
low markings; scape, and anterior and intermediate femora piceous ; 
VEHEK Ale PIII CLInES  SIMAILOW) ware ches sieisiem retin eie'e c ajsre isha oie ererarste angularis 
mAmmomen reddish; at least Hasally sis. oc occa vn ds ane ow ces rufiventris 
PNGomen Mote at all reddish «hte. ciecrere asain raise wise s wines = simplicicornis 
Nysson rufiventris Cresson. 
1882. Nysson rufiventris Cresson, Trans. Amer. Ent. Soc., IX, p. 283. 
1896. Nysson rufiventris Fox, Journ. New York Ent. Soc., IV, p. 15. 
Males 5, females 13: Mitchell (1), Harrison (5) and Glen 
(12) ; June 27 to August 21; visits flowers of Helianthus sp. and 
Cleome serrulata. 
Nysson simplicicornis Fox. 
1896. Nysson simplicicornis Fox, Journ. New York Ent. Soc., IV, 
p.\ 15. 
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