The Sphegoidea of Nebraska 69 
close, anterior margin sinuate so as to form what almost might be called 
two obtuse teeth; face above clypeus with punctures considerably more 
dense; a distinct tubercle between bases of antennae in front; punctures 
on vertex still more distinct, much sparser on occiput and cheeks, faintly 
striato-punctate just back of the eyes; posterior ocelli about as far apart 
as space from them to the nearest eye margin, the latter slightly depressed; 
scape of antennae black, finely punctured; flagellum pale beneath, darker 
above; mandibles black, rufous at tips which are bluntly rounded, with 
several longitudinal grooves outwardly. Pronotum closely punctured and 
strongly ridged, somewhat sinuate above and clothed with sparse golden 
pubescence. Mesonotum sparsely punctured, more closely so just before 
scutellum, with four or five longitudinally impressed lines anteriorly and 
a short one on each side just above the tegulae; pleura faintly striate 
above, finely punctured on disk; scutellum very sparsely punctured on the 
disk, longitudinally striate posteriorly, postscutellum with long golden 
pubescence. Metathorax with strong longitudinal rugae above turning 
obliquely at the juncture with the posterior face and then becoming irreg- 
ular and coarsely reticulate; median depression strong; metapleura almost 
smooth basally, roughened and with quite long pubescence apically. Peti- 
ole about equal in length to the first segment, somewhat shorter than the 
hind femora, broad, width about one-fifth of its length, a longitudinal 
sulcus on each side above and each lateral face with a broad sulcus. First 
three segments of abdomen and base of fourth red, remaining segments 
black with margins testaceous, apical segments faintly punctured. Py- 
gidium broad, strongly but not coarsely punctured, distinctly margined. 
Ventral segments with a few stiff hairs apically, the last four segments 
finely punctured. Legs brownish, anterior tibiae and tarsi ferruginous, 
clothed with golden hairs. Wings smoky hyaline, iridescent; second cu- 
bital cell narrowed two-thirds above. 
3. Unknown. 
Type, Lincoln, Nebraska. This species falls in the group ar- 
gentifrons of Fox, and judging from the descriptions is nearest 
to basirufa, but differs essentially in the sulcation of the petiole 
and the extent of red on the abdomen. 
Mimesa cressonii Packard. 
1867. Mimesa Cressonii Packard, Proceedings of the Entomological 
Society of Philadelphia, vi, p. 405. 
1898. Psen Cressonii Fox, Transactions of the American Entomolog- 
ical Society, xxv, p. 12. 
Ranges across the entire state, specimens from Lincoln, West 
Point, Glen, and Warbonnet canyon being before me. These 
specimens have the pubescence on the vertex more of a golden 
391 
