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PROCEEDINGS OF THE NATIONAL MUSEUM 



with three closely appressed denticles, the apical one much the larger 

 and the basal one very inconspicuous; antenna normal in form and 

 largely fulvous. 



Thorax black except for two widely separated patches on the 

 pronotum and the metanotum, which are creamy yellow; tegulae 

 low, smooth, and fulvous in color; enclosure heavily ridged longi- 

 tudinally; mesostemal tubercles absent; legs fulvous; wings subhya- 

 line but clouded with fulvous. 



Abdomen with the first segment largely fulvous with a semidivided 

 creamy-yellow band on the tergum, terga 2 to 5 with subequal creamy- 

 yellow bands broadly emarginate; venter immaculate; pygidium with 

 sides sHghtly convex and converging to a narrower rounded apical end. 



Male. — Positive identification still uncertain. 



Specimens of females examined show considerable variation in the 

 form of the clypeal process. C. nebrascensis is related closely to C. 

 nigrescens F. Smith, but the fulvous color readily distinguishes the 

 former from the latter species. C. nebrascensis is very close to C. 

 wyomingensis Scullen in size, general color pattern, and distribution, 

 but the form of the clypeal process easily separates them; however, 

 in both species the clypeal process shows considerable variation in 

 form. 



Figures 88, 89. — Localities of: 88, C. nebrascensis H. S. Smith; 89, C. nigrescens nigrescens 

 F. Smith. 



Type. — The type female and one paratype male, both from Glen, 

 Sioux Co., Nebr., 4000 ft., Aug. 15, 1906, are at the University of 

 Nebraska. 



Distribution. — This rare species has been taken only in the North 

 Central States as indicated by the following records. Specimens are 

 as follows: 



