The Sphegoidea of Nebraska 43 
space between antennae strongly longitudinally carinate, the carina very 
high; sides of face punctured as cheeks; median lobe of clypeus with a 
crescent-shaped projection which is quite broad; distance between the 
points equal to the length of the first three flagellar joints; from the an- 
terior edge of this projection hangs a leathery flap which is interrupted | 
medially; anterior margin of clypeus with two teeth, a carina extending 
upwards from each tooth; mandibles with a large and a small tooth in- 
ternally toward apex. Prothorax strongly punctured, rounded and im- 
pressed medially, propleura irregularly ridged. Mesonotum and scutellum 
rather coarsely punctured, the former with two longitudinal impressed 
lines medially and quite close together; mesopleura and mesosternum 
coarsely and closely punctured; postscutellum finely and sparsely punc- | 
tured; metathorax coarsely and rather closely punctured, with a strongly 
impressed median sulcus which forks above to form the basal enclosure, 
which, excepting for faint indications of fine punctures, is smooth and 
shining within; the lateral grooves bounding this enclosure have the ap- 
pearance of being foveolate; upper portion of metathoracic epimeron striate 
above, shining below; upper half of metapleura strongly punctured, lower 
portion smooth with an oblique carina. First abdominal segment globular, 
with medium-sized rather sparse punctures, remaining segments punc- 
tured as first; venter piceous, the segments with a few coarse punctures 
apically and laterally, basal portions of segments which fit beneath the pre- 
ceding segment finely punctured. Legs with rather weak spines. 
CoLorRATION.—Lateral portion of face up to antennae, carina between 
them, anterior portion of clypeal projection, clypeus excepting anterior 
margin, line on mandibles exteriorly, triangular dot behind eyes, collar 
above, parts of legs, small dot on each side of first abdominal segment, 
and apical two-thirds of second, bright yellow. Tuibiae and tarsi rufous, 
with some yellow anteriorly, femora rufous, black behind; scutellum with 
two reddish spots, tegulae red, antennae red in front. Wings almost as 
dark as in fumipennis. | 
3. Unknown. 
Type, a female taken at Lincoln, during July. This is a very 
distinct species in the shape of the clypeal projection, the one- 
banded abdomen, and the color of the wings. 
Cerceris sexta Say. 
1837. Cerceris sexta Say, Boston Journal of Natural History, i, p. 382. 
1859. Cerceris sexta Say, Leconte edition, ii, p. 763. 
1865. Cerceris sexta Cresson, Proceedings of the Entomological So- 
ciety of Philadelphia, v, p. 119. : 
A single male specimen taken at West Point (L. Bruner). 
365 
