WASP GENUS CERCERIS — SCULLEN 507 



Female. — Length 15 to 18 mm. Black with pale yellow to creamy- 

 white markings; punctation average; pubescence slightly longer than 

 average. 



Head subequal in width to the thorax; black except for large eye 

 patches on the face, surface of the clypeal process, base of mandibles, 

 and large round spots back of the compound eyes, aU of which are 

 pale yellow ; clypeal border with a medial extension bordered laterally 

 by an irregular heavy carina; clypeal process broader than long with 

 the points somewhat angular; mandibles black except at the base 

 with two adjoining small subequal denticles; antennae normal in 

 form, basal haK Ught amber, and apical half somewhat darker. 



Thorax black except two elongate patches on the pronotum, the 

 scutellum, and large patches on the propodeum, all of which are pale 

 yellow; tegulae amber, low, and smooth; enclosure ridged longitudi- 

 nally but spreading out somewhat posteriorly; mesosternal tubercles 

 absent; legs reddish amber with the basal segments darker; wings 

 subhyaline tinged with amber. 



Abdomen black with pale yellow to creamy- white markings; tergum 

 1 with two large hght yellow patches; terga 2 to 5 with broad but 

 deeply emarginate hght yellow bands; tergum 6 black; venter black; 

 pygidium with sides converging apically to a truncate end. 



Male. — Length 14 to 15 mm. The type, which is a small specimen, 

 is 12 mm. Black with pale yellow or creamy- white markings; puncta- 

 tion average; pubescence slightly longer than average. 



Head black except entire face, smaU round spot back of eyes, base 

 of mandibles, and scape, all of which are pale yellow; clypeal border 

 with medial lobe extended and with three small denticles on the 

 margin of the extension ; hair lobes on the lateral wings only; mandibles 

 mth a broad lobe medially on the lower margin; antennae dark amber 

 with the basal segments Hghter and the scape yellow, terminal seg- 

 ment curved. 



Thorax black with two large patches on the pronotum, the scutel- 

 lum, patch on the propodeum, and the tegulae, all of which are pale 

 yellow; tegulae low and smooth; enclosure with a medial groove, 

 smooth except for lateral ridges approximately 45° to the base; mesos- 

 ternal tubercles absent; fore- and midlegs dark fuscous to near the 

 center of the femora, beyond which they are yellow ; the hindlegs are 

 mostly yellow basally to beyond the center of the femora, which are 

 light amber on the apical third; apical segments of the hindlegs are 

 yellow infused with amber; wings subhyahne tinged mth amber. 



Abdomen black with two pale yellow patches on tergum 1 ; terga 2 

 to 6 with broad pale yellow bands deeply emarginate; tergum 7 black; 

 venter black except for lateral pale yellow patches on stemites 2 to 5; 

 pygidium with sides subparallel and apical corners rounded. 



