The Sphegoidea of Nebraska ai 
Family PHILANTHIDAE 
KEY TO THE SUBFAMILIES 
Cubital vein in hind wings most frequently interstitial, or originating be- 
fore the transverse median vein, very rarely originating slightly be- 
yond it; hind femora not much thickened at apex, and neither squarely 
truncate nor produced beneath; metanotum most frequently without a 
well-defined triangular area at base............... PHILANTHINAE 
Cubital vein in hind wings originating at considerable distance beyond the 
transverse median vein; hind femora more or less thickened at apex, 
and squarely truncate and produced beneath; metanotum with a well- 
Gennedetrianeular area at. DASEw ais csctecuedeleie sis eree sre CERCERINAE 
Subfamily PHILANTHINAE 
KEY TO THE GENERA 
Eyes more or less emarginate within; submedian cell of posterior wings 
as long as or slightly longer than the median on the median vein; 
female withott a pycidsal arealy i... coc. ewes « oe Seis a ds Philanthus 
Eyes entire within; submedian cell of posterior wings much shorter than 
the median on the median vein; female with a distinct pygidial area, 
Aphilanthops 
Genus Philanthus Fabricius 
SYNOPSIS OF THE SPECIES 
Small species, 7 to 10 mm. in length; yellow bands of abdomen more 
or less emarginate, irregular or wavy; punctures of abdomen shal- 
low; segments, excepting between first and second, not strongly 
ESOS) EGR FEL? Vays pi ree at ony a Aa ee ee ome oe Pre Sin ren 1 
Larger species, 9 to 16 mm. in length; yellow bands of abdomen as a 
rule more regular on their anterior and posterior margins, al- 
though often interrupted in the middle; punctures of abdomen 
deep in the small species; constrictions between segments rather 
Siun(OUNES. eee otic Re nteeot oe a Doom Od Co ania TES TO OnOn OED oop ban aa Gucne 6 
PPS Nye ee ATS AOU | ook cc J. vicile o.c,ne.5tiaw™ vibe «cls eel ew Ee 2 
dH VVAOSSetaintlve Guoed with EUSCOUS:. 22 stents os one atten ehemereie - 3 
2. Head, thorax, and venter with long white pubescence; flagel- 
lum blackish beneath, basal joints yellow.......... albopilosus 
2. Head, thorax, and venter with short, sparse white pubes- 
cence; flagellum pale testaceous, first basal joint only, 
ENOL Ti ELS Fen) os ate, civsties 89 gud ciate hg Sle phere arutetenats orate Ppsyche 
3. Mesonotum and abdomen impunctate, highly polished; second ab- 
dominal segment with two broad lunate marks, following 
segments with narrower yellow bands, basal segment 
sometimes with two small spots, sometimes immaculate, 
bilunatus 
353 
