WASP GENUS CERCERIS — SCULLEN 449 



with slight emargination ; venter with little or no markings; pygidium 

 ferruginous. 



Male. — Unknown. 



Types. — The type female, from Phoenix, Ariz., 1100 ft., Aug. 10, 

 1946 (H. A. ScuUen), is at the U.S. National Museum, no. 66169. 

 Paratypes are as follows: 



Arizona: cf, Canelo, July 30, 1956 (G. D. Butler); ? , Cortaro, July 28, 1956, 

 cotton (T. Dees) ; 9 , Ft. Thomas, Graham Co., 2700 ft., Aug. 7, 1946 (H. A. 

 Scullen); 9, Tucson, 2500 ft., Aug. 13, 1946 (H. A. Scullen) ; 9, 10 mi. E. 

 Tucson, July 30, 1955, Croton (G. D. Butler) ; 9 , S. Tucson, July 26, 1956, cotton 

 (C. Williams). 



Distribution. — Known only from Arizona. 



Prey record. — None. 



Plant record.— Cotton (Arizona), Croton sp. (Arizona). 



42. Cerceris rufa, new species 



Figure 61 



Female. — Length 10 mm. Black with yellow and rufous markings; 

 punctation and pubescence average. 



Head subequal in width to the thorax; black except the entire face 

 below the antennal scrobes, small spot back of the eye, and the basal 

 two-thirds of the mandibles, all of which are yellow, heavily infused 

 with fulvous; clypeal border with three blunt denticles, to the side of 

 each lateral denticle a slight carina; the clypeal process is reduced to 

 a low rounded elevation slightly more than an exaggerated convex 

 area; mandibles with three denticles, the most apical one very large 

 with a deep incision at its apical side and the most basal one low and 

 broad; antennae normal in form. 



Thorax black except for a semidivided band on the pronotum, the 

 scutellum, most of the propodeum exclusive of the enclosure, and the 

 tegulae, all of which are ferruginous; tegulae low and smooth; en- 

 closure with a medial groove and deep pits along the lateral margins; 

 mesosternal tubercle absent; legs ferruginous; wings subhyaline 

 clouded with ferruginous. 



Abdomen with the first three terga rufous and the posterior three 

 black; venter with the first two sternites rufous, the third sternite 

 black and rufous, and the remaining sternites black; pygidium with 

 the sides slightly convex and ends subequal in width. 



Male. — Length 10 mm. General coloring as on the female; 

 punctation and pubescence as on the female. 



Head black except the entire face below the antennal scrobes and 

 the basal half of the mandibles, v/hich are yellow infused with fulvous; 

 clypeal border with three low denticles; hair lobes broad, extending 



