382 PROCEEDINGS OF THE NATIONAL MUSEUJVl vol. us 



Distribution. — Recorded only from Davis and southern California. 



Prey records. — None. 



Plant records. — As indicated under type material. 



16c. Cerceris finitima vierecki Banks, new status 



Figure 19 



Cerceris vierecki Banks, 1947, p. 30. — ScuUen, 1951, p. 1011. 

 Cerceris finitima vierecki Scullen, 1960, p. 80. 



Female. — Length 8 mm. Colors black with creamy-white mark- 

 ings; finely and moderately pitted; pubescence average. 



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

 and round spots back of the compound eyes, which are creamy white; 

 clypeal border with two widely separated pointed extensions; clypeal 

 surface slightly convex without special elevations; mandibles with 

 two subequal denticles distinctly separated, the apical one much the 

 larger; antennae normal in form, scape creamy white, peduncle dark 

 amber, flagellum light amber below and darker above. 



Thorax black except for two elongate patches on the pronotum, 

 two patches on the scutellum, the metanotum, large patch on the 

 pleuron below the wing attachment, and patches on the tegulae, all 

 of which are creamy white; tegulae more smooth and less elevated 

 than in C. finitima finitima Cresson ; enclosure smooth except for the 

 central groove, which is pitted, and the lateral borders, which are 

 slightly rugose; mesosternal tubercle extremely inconspicuous; legs 

 black basally to beyond the middle of the femora, creamy white 

 beyond except for an amber patch on the mesal side and apical end 

 of the hindtibiae and the tarsi, which are darker; wings subhyaline 

 except the stigma, which is dark amber. 



Abdomen black except for a patch on tergum 1, and emarginate 

 bands on terga 2 to 5, which are creamy white; venter black, immac- 

 ulate; pygidium oval with both ends rounded. 



Male. — The males taken in the same localities as the females 

 of C. finitima vierecki are of the typical form and color pattern of C. 

 finitima finitima but the markings tend to be more creamy white as 

 is true of the females. 



Type. — The type female of Cerceris vierecki Banks, taken at Tempe, 

 Ariz., Aug. 1 (Bequaert), is at the Museum of Comparative Zoology, 

 no. 23544. 



Distribution. — Largely throughout the Southwestern desert area 

 of Arizona, New Mexico, and Texas; rare in Colorado and Utah. 



Prey record. — None. 



Plant record. — Acacia sp. (Arizona), Asclepias subverticillata 

 (Arizona), Baccharis glutinosa (Arizona), cotton (New Mexico), 



