432 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



36. Cerceris sandiegensis, new species 



FiGUEE 49 



Female. — Length 14 mm. Black with yellow markings; very 

 little amber; punctation and pubescence normal; structurally near 

 the female of C. compada compacta Cresson except it averages slightly 

 longer and more slender. Enclosure somewhat smoother. 



Head black except face below antennal scrobies, two spots on the 

 vertex, patch back of the compound eye, basal two-thirds of mandibles, 

 and scape, all of which are yellow; apical third and denticles of 

 mandibles very dark; peduncle and basal segments of flagellum 

 amber, apical segments darker. 



Thorax black except band on pronotum, scutellum, narrow patch 

 on metanotum, patch on the propodeum, tegulae, and spot on the 

 pleuron, all of which are yellow; legs largely yellow with the femora 

 becoming amber to dark amber dorsally; wings subhyaline with a 

 more clouded area along the anterior part. 



Abdomen almost entirely yeUow except anterior part of terga 1 

 and 2, sternite 1, and anterior part of sternite 2, all of which are very 

 dark amber to black. 



Many females have the patch on the propodeum C-shaped and 

 some are intermediate. 



Male. — Length 12 mm. Black with yellow markings; punctation 

 and pubescence normal; structurally near the male of C. compacta 

 compacta Cresson except it averages slightly larger; enclosure some- 

 what smoother. 



Head black except for the face, two small spots back of the eyes, 

 anterior two-thirds of mandibles, and scape, all of which are yellow; 

 apical third of mandibles very dark; antennae beyond scape amber 

 for the first 2 or 3 segments, gradually changing to a very dark amber. 



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

 small patches on the scutellum, patch on the propodeum, smaU patch 

 on the pleuron, and the tegulae, all of which are yellow; enclosure 

 relatively smooth; legs black and yellow; posterior trochanter largely 

 yellow; all femora mostly dark amber to black; tibiae and tarsi 

 mostly yellow, becoming amber on the apical tarsal segments; wings 

 subhyaline with a more clouded area along the anterior part. 



Abdomen almost entirely yellow except the anterior part of terga 1 

 and 2, sternite 1, and anterior part of sternite 2, all of which are dark 

 amber to black. 



Types. — The type female, from two miles east of Anza, Riverside 

 Co., Calif., July 14, 1956, on Oroton calif ornica (M. Wasbauer), and 

 allotype male, IdyUwild, Riverside Co., Calif., June 27, 1956, on 



