478 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



Thorax black except for two patches on the pronotum, the meta- 

 notum, a large patch on the propodeum, a minute spot on the pleuron, 

 and a patch on the tegulae, all of which are creamy white to creamy 

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

 and the surface Ughtly ridged medially, parallel to the meson, and 

 with heavier ridges near the lateral angles at about 45° to the base; 

 mesosternal tubercles absent; legs fulvous with limited yellow patches, 

 wings subhyaUne, slightly clouded at the apical border. 



Abdomen black with subequal bands of creamy white on all terga 

 1 to 5 except that the band on tergum 1 is divided medially; venter 

 with variable patches of creamy white laterally on stemites 2 to 5; 

 pygidium with the sides slightly convex, the apical end rounded 

 and the basal end slightly broader and not rounded. 



Male. — Length 10 mm. Black with yellow and creamy-white 

 markings; punctation and pubescence average. 



Head slightly wider than the thorax; black with the exception 

 of the entire face, spot back of the eye, basal half of the mandibles, 

 and the scape, all of which are yellow; clypeal border with three 

 widely separated denticles; clypeal surface with a very charac- 

 teristic ridge just above the border extending the full mdth of the 

 medial lobe, above which is a prominent flat area; hair lobes short, 

 extending from the eyes over about two-thu'ds of the distance to 

 the lateral clypeal denticles; mandibles with a broad sinuate carina; 

 antennae normal in form. 



Thorax black except for two patches on the pronotum, the meta- 

 notum, patch on the propodeum, and the tegulae, all of which are 

 light yellow; tegulae low and smooth; enclosure with a medial 

 groove, moderately ridged with the ridges spreading apically; meso- 

 sternal tubercle absent; legs largely yellow with the apical end of 

 the hindfemora fuscous and fuscous patches on the fore- and mid- 

 femora and the hindtibiae. 



Abdomen black with two separated patches on tergum 1 and sub- 

 equal narrow bands on terga 2 to 6, slightly emarginate, which 

 are creamy white; venter with wedge-shaped, creamy- white patches 

 on stemites 2 to 5; pygidium with sides slightly converging apically 

 to a semitruncate end. 



Several earlier workers appear to differ in their identification 

 of the male of C. deserta Say, on which the species was estabhshed. 

 Also there apparently has been some misidentification of the female 

 of the species. The present writer bases his recognition of the 

 male on the following facts: (1) A specimen labeled "Neotype" 

 in the Museum of Comparative Zoology, Harvard, is the species 

 herein recognized as deserta Say; it is assumed this "Neotype" 

 label was placed on the specimen by Banks. (2) The species as 



