486 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ue 



triangular patches on sternites 2 to 5; pygidium sides very slightly 

 convex, ends subequal in width, the apical end very slightly convex. 



The male of C. macswaini Scullen is almost indistinguishable from 

 the male of C. calochorti Rohwer. The enclosure of the former usually 

 is ridged considerably while that of the latter is smooth except for 

 the usual medial groove. So far, the known geographical ranges do 

 not overlap. 



Types. — The type female and allotype male of C. macswaini 

 Scullen, from Imperial Co., Calif., June 1911 (J. C. Bridwell), are 

 deposited at the U.S. National Museum, no. 67731. Paratypes are 

 as follows : 



Arizona: 9 (C. F. Baker). California: 41 9 9, 61 cf c^, Imperial Co., May, 

 June 1911 (J. C. Bridwell); 2 9 9, 2 d'd^, Imperial Co., June 1912 (J. C. Brid- 

 well) ; 16 9 9 , 6 cf cf , Experiment Farm, Imperial Co., June 1912 (J. C. Bridwell) ; 

 3 9 9, Blythe, Riverside Co., June 14, 1945 (E. G. Linsley) ; 3 9 9 , Blythe, 

 July 20, 30, 1947 (J. W. Maeswain) ; 9, Holtv-ille, Imperial Co., Aug. 11, 1917 

 (J. Bequaert) ; 3 9 9 , Palm Springs, Riverside Co., June 22, 1945. 



Distribution. — This species is known only from southern Cahfornia 

 and adjoining Arizona. 



Prey record. — None. 



Plant record. — Baccharis glutinosa, Hyptis emory, Tamarix jallica 

 (all from California) . 



59. Cerceris melanthe Banks 



Figures 85, 165a,b,c 

 Cerceris melanthe Banks, 1947, pp. 21-22.— Scullen, 1951, p. 1009. 



Female.- — Length 6 to 10 mm. Black with yellow markings; 

 punctation coarse; pubescence average. 



Head subequal in mdth to the thorax; black except for the entire 

 face below the antennal scrobes, a small spot back of the compound 

 eye, and base of the manidibles, all of which are yellow; the cl3^peal 

 border (here considered the lower of two parallel rows of denticle-like 

 processes) consists of a broad medial tridentate process, to each side 

 of which is an indistinct denticle; clj^peal elevations (here considered 

 the upper of the two parallel rows of denticles) consists of three 

 denticles, the medial one small and very acute and the two lateral 

 ones somewhat larger and rounded apicaUy; the two parallel rows of 

 elevations are separated by a depression that is black including the 

 two rows of denticles; mandibles with one large denticle, basad of 

 which is a much smaller denticle; antennae normal in form. 



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

 metanotum, a small patch on the propodeum, and the tegulae, all of 



