1947] 
Cerceridce 
23 
rufous on sides. Each ventral segment, back of second, 
shows a bristly punctate lobe each side, and connecting 
punctate ridge in middle. On sixth segment the ridge is 
elevated, each side into a broad lobe, with several fairly 
large teeth grouped around the outer corner. Pygidium 
slender, sides nearly parallel, and nearly twice as long as 
broad in middle, tip truncate. Legs almost wholly yel- 
lowish, tips of hind tibiae dark, and hind tarsi dusky. 
Length 9 mm. 
One from Jacumba, Calif., 12 August 1917 (W. M. 
Wheeler). Type M.C.Z. no. 27622. 
Cerceris illota sp. nov. 
Male. Face yellowish, the lateral and supraclypeal 
marks tend to extend upward toward top of eyes and the 
anterior ocellus, sometimes connected with spots or band 
on vertex ; with short, silvery hair, hair-lobes no broader 
than lateral lobes. Usually a comma-shaped rufous spot 
back of each eye, and sometimes a rufous band across 
vertex from eye to eye, often absent, or two spots. An- 
tennae with scape pale, second and third joints usually 
rufous, beyond brown, but tip of last joint rufous, third 
not longer than fourth. Pronotum with the yellow spots 
meeting ; mesonotum black, stained with rufous, or all ru- 
fous, a yellow spot under base of fore wings ; scutellum 
usually rufous, postscutellum yellow; pleura and pro- 
podeum black to rufous, yellow stripe each side on pro- 
podeum ; enclosure fairly broad, smooth, but with one or 
two punctures in upper corners. 
First segment of abdomen rufous, dorsum plainly 
broader than long; second segment more than twice as 
broad behind as first, sides broadly convex, a nearly 
square rufous or black spot indenting the broad yellow 
band covering the rest of the segment; other segments 
completely covered with yellow band, sometimes slightly 
indented in front with rufous; from above the segments 
show the denticulate appearance at outer hind corners. 
Venter black, with pale yellowish, punctate spots on side 
narrowly connected across middle. Pygidium one and 
one-half times as long as broad in middle, tip usually a 
