WASP GENUS CERCERIS — SCULLEN 363 



very much smaller) ; p^^gidimn with sides convex and the apical end 

 slightly smaller than the basal end. 



The male of bridwelli ScuUen is very close to the male of crotonella 

 Viereck and Cockereil in size, sm-face sculptm^ing, and color pattern 

 except there are three broad bands on the terga of the former and two 

 broad bands on the terga of the latter; however, the band on torgum 

 3 of the former occasionally shows a slight emargination or medial 

 evanescent black spot. 



Yellow areas on both sexes show some variation in extent and smaller 

 spots may disappear in some specimens; band on tergum 4 may be 

 more or less emarginate. 



Types, — Type female and allotype male, from Imperial Co., Calif., 

 June 1911 (J. C. Bridwell), are at the U.S. National Museum, no. 

 66154. Paratypes are as follows: 



Arizona: 2 9 ?, 25 mi. W. Blythe, June 1937 (J. C. Elmore); 2d'c?, 11 mi. 

 SW. Eloy, Pinal Co., June 19, 1953 (T. R. Haig) ; 9, Bd^cT, 10 mi. S. Toltec, 

 Pinal Co., June 15, 21, 1953 (T. R. Haig); 9, Tucson, Apr. 25, 1940 (R. H. 

 Crandall); 9, Yuma, May 4, 1918 (J. C. Bradley); 9, Yuma, May 6, 1939 

 (M. R. Bohart). California: 9, Blythe, Riverside Co., May 8, 1947 (J. W. 

 MacSwain, F. G. Linsley); 9, Borego, San Diego Co., Apr. 5, 1940 (R. M. 

 Bohart); 5 9 9, lld^cT, Borego, San Diego Co., Apr. 25, 26, 27, 30, 1954, Croton 

 californicus, Eriogonum inflalum (M. Wasbauer) ; cf, Borego, San Diego Co., 

 May 2, 1952 (P. D. Kurd); 4 9 9 , 5cf cf, Borego Valley, San Diego Co., May 26, 

 1954 (F. X. Williams); <?, Calexico, Aug. (Bequaert); 9, Colorado Desert, May 

 12, 1935 (G. E. Bohart); 9, d", Desert Center, May 22, 1939 (E. P. Van Dyke); 

 9, Dos PalmOS, Riverside Co., Apr. 3, 1934 (G. E. Bohart); 44 9 9, 57d'dr, 

 Imperial Co., Experiment Farm, April, May, and June 1911, May and June 1912, 

 Baccharis glutinosa (J. C. Bridwell); 7 9 9, 35crcf, 4 mi. E. Mecca, Riverside 

 Co., July 16, 21, Aug. 15, 1956, Croton californicus (M. Wasbauer); 9 , San Felipe 

 Creek, San Diego Co., July 8, 1933 (G. E. Bohart); 9, cf, Westmorland, May 

 1932 (G. E. Bohart). Mexico: Baja California: 9, Los Animas Gulf, May 8, 

 1921 (E. P. Van Duzee). 



Distribution. — Southern Arizona and southern California. 



Prey Record. — None. 



Plant Record. — As listed under paratypes. 



6. Cerceris butleri, new species 



Figures 6, 112a,b,c 



Female. — Length 7 mm. Black with creamy-white markings; 

 normally pitted; clothed with very short silvery hairs. 



Head slightly wider than the thorax, black except for the frontal 

 eye patches, which are creamy white; clypeal border with a medial 

 denticle and two lateral denticles appearing just below and laterad 

 of the clypeal process; clypeal process very short and low with a 

 tendency to be emarginate on some specimens, subequal in width to 



