446 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ne 



Thorax black except for two elongate patches on the pronotum, 

 band on the scutellum, small patches on the propodeum, and the 

 tegulae, all of which are yellow; tegulae low and smooth; enclosure 

 with a light medial groove and deep pits laterally; mesosternal tubercle 

 absent; legs largely amber to nearly black toward the base, becoming 

 lighter on the more apical segments; wings subhyaline but clouded 

 along the anterior margin. 



Abdomen black except for a wide band on tergum 1, a wide emargi- 

 nate band on tergum 3, narrow lines on terga 4 and 5, all of which are 

 yellow; venter immaculate; pygidium with sides convex and both 

 ends rounded and subequal. 



There is a tendency for the band on tergum 3 to become less 

 emarginate and the legs to become darker in specimens from the 

 South Central States; small spots of yellow may appear laterally on 

 some sternites. 



Male. — Length 10 mm. Black with yellow markings; punctation 

 somewhat coarser than average; pubescence average. 



Head subequal in width to thorax; black except entire face below 

 antennal scrobes and patch on the scape, which are yellow; clypeal 

 border with three indistinct denticles; hair lobes broad, almost 

 meeting; mandibles without denticles but with a carina medially. 



Thorax black except for two elongate patches on the pronotum, 

 the scutellum, small patch on the propodeum, and the tegulae, all of 

 which are yellow; tegulae low and smooth; enclosure with a light 

 medial groove and deeply pitted laterally; mesosternal tubercle 

 absent; fore- and midlegs dark to near the apical end of the femora, 

 beyond which they are light amber; basal two segments of the hindlegs 

 largely yellow, femora dark amber, remaining segments lighter amber 

 infused with yellow; wings subhyaline, clouded along the anterior 

 margins. 



Abdomen black except medium wide bands on terga 1 and 3, 

 broken lines on terga 4, 5, and 6, all of which are yellow; venter 

 with a yellow band on sternite 3; pygidium with sides subparallel 

 and ends subequal in width. 



The male of C. insolita Cresson is close to male of C. zelica Banks, 

 from which the former can be separated by the immaculate second 

 tergum of its abdomen. The female is close to C. compar orestes 

 Banks, from which the former can be separated by the form of its 

 clypeal elevation. Males from the southwest are difficult or impossible 

 to separate at present from males of C. compar orestes Banks. Females 

 of C. compar orestes Banks are distinct and have been taken only in 

 the southwestern desert area. C. insolita insolita Cresson can be 

 confused with C. tolteca Saussure, which it superficially resembles. 



