WASP GENUS CERCERIS — SCULLEN 399 



are similar to those of C. conifrons Mickel, but the two species are 

 very distinct in other respects. 



Types. — The type female, from San Diego, Calif., June (E. P. Van 

 Duzee), is at the Museum of Comparative Zoology, Harvard, no. 

 10030. The type female of C. complanata Mickel, taken at Auburn, 

 Calif., Sept. 20, 1916 (L. Bruner), is at the University of Nebraska. 

 The allotype male of C. complanata Mickel, taken at the same location 

 and date, is also at the University of Nebraska. 



Distribution. — The subspecies C. vanduzeei vanduzeei Banks is 

 recorded only from California. 



Prey record. — None. 



Plant record. — Chaparel (California), Croton californicus (Cali- 

 fornia), Eriogonum fasciculatum (CaUfornia). 



24b. Cerceris vanduzeei eburnea, new subspecies 



Figure 30 



Female. — Length 9 to 10 mm. Black with white markings; 

 closely and deeply pitted; clothed with very short silvery hairs. 



Head about one-fifth wider than the thorax; black except for large 

 frontal eye patches, large spot on medial lobe of clypeus, small spot 

 back of compound eyes, basal part of mandible, and patch on scape, 

 all of which are white; clypeal border with five distinct denticle-like 

 extensions on the medial section; clypeal surface with a centrally 

 located low, blunt elevation, below which are two black denticles 

 very close to the clypeal border; mandibles with one prominent 

 denticle, basal of which is a very small evanescent denticle; antennae 

 normal in form, scape with a creamy-white patch, peduncle amber, 

 flagellum light amber below and darder above. 



Thorax black except for two elongate patches on the pronotum, 

 two spots on the scutellum, the metanotum, patch on the pleuron, and 

 patch on the tegulae, all of which are creamy white; tegulae smooth 

 and not elevated; enclosure heavily and irregularly ridged at a 45° 

 angle to the medial groove and deeply pitted laterally; mesosternal 

 tubercle present; legs black to near the apical ends of the femora, 

 beyond which they are creamy white except for patches of amber on 

 the tibiae and the tarsi, which are darker; wings subhyaline, becoming 

 cloudy at the apex, except the stigma, which is amber. 



Abdomen black with white bands on terga 1 to 5; bands on terga 

 2 to 5 emarginate; band on tergum 2 broader than others; pygidium 

 suboval with both ends rounded; venter dark amber, immaculate. 



Male. — Unknown. Probably it is being confused with closely 

 related forms. 



The females show considerable variation in the amount of white on 

 the face. It is common for all of the white on the face to disappear 



