466 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



Abdomen largely yellow on the terga with small ferruginous patches 

 laterally on terga 2, 3, and 4; venter ferruginous with lateral yellow 

 patches on sternites 2, 3, and 4, 



Male. — Length 14-15 mm. Structurally like C. bicornuta bicor- 

 nuta Guerin but colors are lighter. 



Head yellow on the face, ocellar area black, occiput and genae 

 ferruginous. 



Thorax ferruginous and yellow; pronotum with a yellow band 

 slightly emarginate; metanotum and tegulae yellow; propodeum and 

 enclosure ferruginous; legs ferruginous with the basal parts largely 

 yellow; wings shaded with ferruginous. 



Abdomen with the terga largely yellow except for lateral ferruginous 

 patches on terga 2, 3, and 4; venter largely yellow emarginate or 

 divided by ferruginous. 



Type. — ^The type female of C. jidelis Viereck and Cockerell, from 

 Santa Fe, N. Mex. (Cockerell), is at the Philadelphia Academy of 

 Natural Sciences, no. 10378. 



Distribution. — Southwestern desert areas. 



Prey record. — Eupagoderes sp. (Krombein, 1959, 1960). 



Plant record. — Alfalfa (Arizona, California), Asclepias sp. (Cali- 

 fornia), Baccharis sarothroides (Arizona), cotton (Arizona), Enogonum 

 sp. (Arizona), Helianthus sp. (Arizona), Melilotus sp. (California), 

 Phacelia sp. (California), Sphaeralcea sp. (Arizona), Tamarix gallica 

 (California). 



51. Cerceris boharti, new species 



Figures 73, 154a,b,c 



' Female. — ^Length 10 mm. Black with light yellow markings; 

 punctation coarse; pubescence average. 



Head slightly wider than the thorax; black except for the entire 

 face below the antennal scrobes and basal two-thirds of the mandibles, 

 which are light yellow; clypeal border with a medial broad extension 

 flanked laterally by single rounded denticles; clypeal surface process 

 in the form of a low horizontal ridge with the extremities slightly 

 dentiform; mandibles with three low and inconspicuous elevations, 

 the medial one the most evident; antennae normal in form. 



Thorax black except for two widely separated patches on the 

 pronotum and a divided band on the metanotum, which are light 

 yellow; tegulae low, smooth, and fuliginous; enclosure smooth except 

 for a medial groove; mesosternal tubercles absent; legs are black to 

 near the apical ends of all femora, apical ends of femor? are ferruginous, 

 tibiae and tarsi are all yellow, tinged with amber except the apical 

 end of the midtibiae and midtarsi, which are dark; wings are sub- 

 hyaline with the apical margin clouded and the stigma very light. 



