18 Annals Entomological Society of America [Vol. V, 
Cerceris chryssipe n. sp. 
Q Similar in most respects to C. clypeata, but the clypeal process is 
broader than long, the abdomen is rather broader and the punctuation 
less coarse; the enclosure is raised in middle with a median furrow, and 
very coarsely striate on sides. 
o The male is similar to C. clypeata in markings and clypeus, but 
has the abdomen very much broader, and with finer punctuation; the 
enclosure more coarsely striate than in C. clypeata. 
From Falls Church, Va., in July, on Cicuta. 
Cerceris dentifrons Cress. 
The type from Illinois has the clypeal process broad, and 
the lateral angles are very strongly produced; more so than in 
any other species seen from the Eastern States. 
Cerceris clypeata Dahlbom. 
From Ithaca, N. Y., and Falls Church, and Glencarlyn, Va., 
in June and July. The pygidial area of the female is more than 
twice as long as broad, the sides sub-parallel, and the tip only a 
little narrower than the base; in the male this area is scarcely 
one and a-half times as long as broad, with broad, truncate tip; 
the hair-lobes are fully twice their breadth apart, I have 
restricted this species more than Cresson or Packard, with a 
definite clypeal process. 
Cerceris deserta Say. 
From Sea Cliff, N. Y., and Falls Church and Glencarlyn, Va., 
in June, July and September; the September specimens are all 
males. The pygidial area of female is two and a-half times 
longer than broad, the sides nearly parallel, and the tip hardly 
narrowed. In male this area is a little over twice as long as 
broad, sides parallel; the hair-lobes are very small, fully three 
times their breadth apart. 
Cerceris arelate n. sp. 
2 Black; mandibles all black, barely a trace of pale near base; a 
spot on clypeal process, a large spot each side on face, tegule, post- 
scutellum, two spots on basal segment (nearly connected), narrow, 
emarginate bands on other segments, yellow; legs yellow, front and 
middle femora black, hind femora black on base, inner tip of hind 
tibia, and most. of hind tarsi blackish; flagellum somewhat yellow at 
base beneath; scape, interantennal carina, and pronotum black, venter 
also black, unspotted; wings fumose, darker on costal apex, stigma 
yellowish. Clypeal process moderately elevate, much broader than 
