New Species of Sphecoidea 15 
spines; arcuate band on first tergite widest at the sides, broad band on 
second tergite deeply and very widely emarginate anteriorly, bands on 
tergites three, four and five, broadly emarginate anteriorly and widened 
at the sides (less so on the fourth and fifth), sinuous apical band on sixth 
tergite, apex of seventh tergite, first sternite almost entirely, second ster- 
nite entirely except the lateral anterior angles, sinuous apical bands on 
sternites three, four, five and six, lateral plates of seventh sternite (except 
outer basal spot) and apex of seventh sternite, apex and spines of eighth 
sternite, all yellowish. Legs entirely yellow except a line on the tro- 
chanters and femora above; intermediate femora serrate beneath; medial 
metatarsi strongly curved and with three spines within near the base; 
posterior femora strongly arcuate. Wings hyaline, yellowish near the 
base. 
°. Unknown. 
Type, a male collected at Worland, Wyoming, July 5, 1917 (L. 
Bruner). 
Runs to pulchella in Parker’s table, but is quite distinct from 
that species in coloration, form of antennae, and the arcuate pos- 
terior femora. 
Family CERCERIDAE 
- 
Cerceris alceste sp. nov. 
9. Length 18 mm. Black, yellow and red. Head with rather long, 
sparse, grayish pubescence; clypeus very strongly produced, the projection 
slightly broader than long; very deeply, roundly and broadly emarginate 
anteriorly, the anterior lateral angles thus appearing as long teeth; sides 
of projection moderately dentate just before the middle and the sides 
declivous between the denticle and the base of the projection; area be- 
neath the projection shining, impunctate; clypeal projection, frons, vertex, 
occiput and genae strongly punctate; ocelli in a very low triangle; first 
joint of flagellum about one and one half times as long as the second; 
base of mandibles, lateral spots on clypeus just above the base of the 
mandibles, clypeal projection (except the margins), frons (except the 
upper third, the supraclypeal and the interantennal areas), and large spot 
behind the eyes, all yellowish-white; median area of mandibles, clypeal 
area below the projection, margins of clypeal projection, spot on the inter- 
antennal carina, scape, pedicel, first five joints of flagellum, vertex, occiput 
and genae, all ferruginous; remainder of head black. Thorax black, with 
strong, well-separated punctures, and long, sparse, grayish pubescence; en- 
closed area of propodeum rather finely, longitudinally rugose, with a me- 
dian impressed line; two large transverse spots on pronotum, tegulae, spot 
behind the posterior lobes of pronotum, two transverse, contiguous spots 
on scutellum, metanotum and propodeum (except enclosed area and me- 
ce 
