The Sphegoidea of Nebraska 63 
1. Sixth dorsal segment coarsely wrinkled longitudinally; thorax en- 
Ie Lyn bilaClete racic e wake sistas Welebrs Ade Miss svs atayseeiete deal she siOes belfraget 
i sixth dorsal sesment mioré, or less punctured... 2... 0.6 cc. cecin nse ts 2 
2. Wings distinctly banded medially with brown, apex of wings 
clear hyaline, abdomen yellow above with black markings, 
nubilipennis 
2 Wines uniformly hyaline throughout. ......0<... 0 sncsnene 3 
3. Metanotum entirely black (rarely with a single semicircular yellow 
line) ; meso- and metapleura usually without spots. ..spinolae 
3. Metanotum with two semicircular yellow lines; metapleura usually 
Pike PME thE MELO. J, )a01 5 Chas ities ea de's © ome dated when oho ie wee 4 
4, First abdominal segment usually with a continuous band; 
disk of mesothorax without yellow lines; fore coxae and 
ereater part of sides of thorax black.............. troglodytes 
4. First abdominal segment with band usually interrupted; 
disk of mesothorax with two faint yellow lines; fore coxae 
and greater part of sides of thorax yellow............... sayi 
5. Last dorsal segment of abdomen longitudinally ridged; thorax en- 
tirely black; clypeus usually entirely black........... belfragei 
5-Last dorsal segment “more or less punctured... .........5. 000002. 6 
6. Antennal joints not dentate or spinose; intermediate femora 
unarmed beneath; abdomen very hairy............ troglodytes 
6. Antennal joints more or less dentate or spinose............ ii 
7. Mesonotum spotted medially; second and seventh ventral segments 
with a large prominence; first joint of medial tarsi normal, sayi 
fee Viesonotum: not spotted medially. 6. 2.020. ~:~ occcsccseeccsonecee 8 
8. Femora entirely yellow (rarely black at extreme base); 
markings bright yellow; thorax not densely pubescent, 
nubilipennis 
8. Femora about equally black and yellow; markings of abdo- 
men more greenish; thorax rather densely covered with 
Pie ERU SA PLIDESCENCE: 12. et ater de Succe eaves bx mek ae spinolae 
Bembex belfragei Cresson. 
1873. Bembex Belfrageit Cresson, Transactions of the American Ento- 
mological Society, iv, p. 220. 
1893. Bembex Cressonii Handlirsch, Sitzungsberichte der Akademie 
der Wissenschaften, Wien, cii, p. 792. 
1895. Bembex Belfragei Fox, Proceedings of the Academy of Natural 
Sciences of Philadelphia, p. 357. 
Two females, McCook, July, 1905 (M. H. Swenk); one male, 
West Point, June, 1887 (L. Bruner). These specimens lack the 
basal transverse impression of the labrtim which Fox mentions 
in his synopsis, but the peculiar sculpture of the last dorsal seg- 
385 
