24 
Psyche 
[Mar. 
little narrowed. Sixth ventrite has a lobe each side 
tipped with several black (or rufous) teeth, many blunt. 
Legs yellowish to rufous, hind femora darker than 
others, front and mid femora with some large spots of 
white ; hind tibiae dark beyond middle, hind tarsi dusky. 
Wings dark along costa and towards tip as usual. 
Length 9 to 11 mm. 
From Tucson, Arizona, August (Bequaert), also Pata- 
gonia, Arizona, 20 August (Bequaert), and Colton, South- 
ern California, 16 August (Pilate) ; also two from Pal- 
merlee, Arizona (Biedermann). Type M.C.Z. no. 23541. 
Cerceris isolde sp. nov. 
Male. Face wholly yellowish up to upper edge of an- 
tennal fossae, with short silvery hair, most dense toward 
lower margin ; hair-lobes yellowish, short ; antennae mostly 
rufous out to seventh joint, thence black, hut the last joint 
is rufous, and scarcely curved. Face not very broad be- 
low and little narrowed above; lateral lobes high, outer 
side straight, and fully one-third its length against eye. 
Clypeus projects below the lateral lobes and ends in a 
truncate process. Head back of eyes rufous. 
Pronotum rufous, with two yellow spots above; meso- 
notum black, closely and coarsely pitted; scutellum 
broadly and a line on postscutellum yellow; propodeum 
rufous, the enclosure moderately large, mostly smooth, 
but a few punctures on sides ; median groove on pro- 
podeum very distinct, lying in a depression ; mesopleura 
rufous, sternum black. 
Abdomen rather slender; dorsum of first segment al- 
most twice as broad as long; second segment twice as 
broad behind, in front rufous as the first, behind with 
broad yellowish band, four similar bands behind occupy- 
ing all of dorsum, last segment also yellow, all with fine 
whitish hair; pygidium one and one-fourth times as long 
as broad in middle, tip broad, sides little curved, little 
narrowed above. Venter with yellow bands, broad on 
sides, second ventrite yellowish; on the sixth there is a 
cross-ridge, but without teeth. Legs also wholly yellow- 
ish to rufous, hind tibia near inner tip faintly darkened. 
