WASP GENUS CERCERIS — SCULLEN 



369 



white on the posterior margins of terga 2 to 6 (in some specimens 

 an evanescent, narrow, dark line appears on tergum 2 between the 

 yellow band and the ferruginous portion; in some specimens, also, the 

 6th tergum is immaculate) ; venter ferruginous over most of sternites 

 1 and 2 but dark and immaculate over the remaining sternites; 

 pygidium with the sides convex and ends subequal in mdth. 



The males of C. conijrons Mickel may be confused with the males of 

 other closely related forms showing ferruginous or reddish coloring 

 on the basal segments of the abdomen. The distinctions between 

 creamy-white and yellow markings are not always very marked. 



Type. — The type female of C. conifrons Mickel is ai the University 

 of Nebraska. 



Distribution. — Except for one female taken at Medicine Hat, 

 Alberta, on Aug, 13, 1939, by E. H. Strickland, C. conifrons Mickel 

 has been taken only in the western states of Arizona, California, 

 Colorado, Nebraska, Nevada, New Mexico, Texas, Wyoming, and 

 Utah. It has been taken also in the state of Chihuahua, Mexico. 

 (Due to the fact that males of this species sometimes are difficult to 

 distinguish from closely related forms, distribution records are based 

 only on females.) 



Prey record. — None. 



Plant record. — Aster sp. (Utah), Daucus carota (Utah), Chryso- 

 thamnus sp. (New Mexico), Helianthus sp. (Nebraska), Lepidium sp, 

 (Arizona), Norta sp. (Utah), Wislizenia sp. (Arizona). 



Figures 11, 12. — Localities of: 11, C. conifrons Mickel; 12, C. convergens Viereck and 

 Cockereil. 



12. Cerceris convergens Viereck and Cockereil 



Figures 12, 115a,b,c 



Cerceris convergens Viereck and Cockereil, 1904, p. 136. — Scullen, 1942, p. 188. — 

 Banks, 1947, p. 29.— Scullen, 1951, p. 1006. 



