WASP GENTJS CERCERIS — SCULLEN 415 



from which it may be distinguished by the characters given in the 

 key. The males especially are difficult to separate, and the writer 

 has not yet found characters that are dependable in separating them. 



Type. — The type female of C. grandis Banks, taken at Fort Yuma, 

 Ariz., is in the American Museum of Natural History, New York, 

 no. 21181. 



Distribution. — Southern California and adjoining areas. Speci- 

 mens are as foUows: 



Arizona: d', Arlington, July 12, 1956, cotton (G. D. Butler); 9,cf, Roll, 

 June 24, 1955 (G. D. Butler); cf, Wellton, July 12, 1956, cotton (G. D. Butler); 

 cf, Yuma, July 1940 (K. D. Snyder); cf, Yuma Valley, June 14, 1957 (G. D. 

 Butler). California: cf, Blythe, June 23, 1946 (W. F. Barr, R. F. Smith); 

 cf, Coachella Valley, June 26, 1933; ? , Imperial Co., June 1911 (J. C. Bridwell); 

 9, Indio, June 27, 1936 (E. S. Ross); cf, same locality, 1954 (G. E. Bohart); 

 2(^0", 15 mi. S. Indio, June 27, 1936 (M. Cazier); ?, northern end of Salton 

 Sea, May 25, 1940; cf, Thermal, Riverside Co., July 2, 1956, Melilotus alba 

 (M. Wasbauer). 



Prey records. — None. 

 Plant records. — None. 



29b. Cerceris grandis percna, new subspecies 



Figure 38 



Female. — Length 19 mm. Structurally like C. grandis grandis 

 Banks in all respects except for color. The subspecies percna is 

 black with yellow markings and a limited amount of amber. 



Head black or amber except face below antennal scrobies, base of 

 mandibles, broken areas back of compound eyes, and two small 

 patches on the vertex, all of which are yellow; en the genae outside of 

 the above yellow areas back of the compound eyes are amber in the 

 type but black on the paratypes; scape amber but remainder of 

 antennae almost black. 



Thorax black except for a divided band on the pronotum, two 

 small spots on the scutellum, the entire metanotum, two large areas 

 on the propodeum, and a small patch on the mesopleuron, all of which 

 are yellow bordered with amber; an amber area covers much of the 

 mesosternum; legs largely amber; wings subhyaline. 



Abdomen largely yellow except for black patches in the center of 

 all terga joining the basal border but becoming very small on the 6th 

 tergum; venter largely yellow infused with amber. 



The type appears to be somewhat discolored with cyanide. The 

 paratype from San Diego is almost entirely black and yellow with 

 relatively little amber. 



Male. — Unknown . 



