646 



PROCEEDINGS OF THE NATIONAL MUSEUM 



Fig.l74a 



Fig.l75a 



Figures 169-175.— 169, C. nigrescens nigrescens F, Smith; 170, C. nigrescens ardate Banks; 

 171, C. nigrescens munda Mickel; 172, C. nitida Banks; 173, C. occipitomaculata Packard; 

 174, C. sexta Say; 175, C. stigmosalis Banks. (a= lower face of female, i= profile of 

 female, f=pygidium of female, i= lower face of male.) 



