370 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ne 



Cerceris rinconis Viereck and Cockerell, 1904, p. 137. 

 Cerceris hesperina Banks, 1917, p. 115. 

 Cerceris pudorosa Mickel, 1917a, p. 338. 

 Cerceris snowi Banks, 1919, p. 84. 



Female. — ^Length 8 to 9 mm. Color black with light yellow 

 markings; normally pitted; clothed with short silvery hairs. 



Head one-fifth wider than the thorax; black except for large yellow 

 frontal eye patches, the clypeus, and basal part of mandibles, which 

 are light yellow; clypeal border slightly extended at the center and 

 sinuate; clypeal process low and very short, close to clypeal border, 

 divided into two rounded extensions, which are thin at the apex; 

 mandibles with two subequal denticles medially located; antennae 

 normal in form, scape yellow, peduncle dark amber, flagellum light 

 below and dark above. 



Thorax black except for two elongate patches on the pronotum, 

 two spots on the scutellum, the metanotum, a patch on each plem'on, 

 and the tegulae, all of which are light yellow; tegulae are smooth 

 and not elevated; enclosure smooth except for a light medial groove 

 and pitted borders; mesosternal tubercle prominent and tipped with 

 yellow; legs dark amber basally to near the apical ends of all femora, 

 the remainder of each leg being mostly yellow except for an amber 

 patch on the apical end of the hindtibiae; wings subhyaline with a 

 slight clouded area at the apex. 



Abdomen black except for a semidivided patch on tergum 1, a 

 broad band on tergum 2, band on tergum 3, which is usually broken 

 into three sections, narrow bands on terga 4 and 5, all of which are 

 yellow; venter immaculate; pygidium with the basal end broadly 

 rounded and the apical end considerably narrowed to a small rounded 

 point. 



Male. — Length 8 mm. Black with yellow to cream markings; 

 normally to thinly pitted ; clothed with short silvery hairs. 



Head one-fourth wider than the thorax; black except for two 

 yellow frontal eye patches; clypeal border with three centrally lo- 

 cated denticles, the medial one slightly more pronounced; mandibles 

 without distinct denticles; antennae normal in form, scape yellow, 

 peduncle dark amber, flagellum light below and dark above. 



Thorax black except for two elongate patches on the pronotum, 

 the metanotum, and the tegulae, which are light yellow; tegulae 

 smooth and not elevated; enclosure smooth except for an indistinct 

 central groove; mesosternal tubercle absent; legs black basally to 

 near the apical ends of all femora, remainder of all legs yellow except 

 for black patches on apical ends of hindtibiae and darkened tarsi; 

 wings subhyaline except for clouded area at apex. 



Abdomen black except broad band on tergum 2, double broken 



