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PROCEEDINGS OF THE NATIONAL MUSEUM 



Abdomen black with subequal creamy-white bands covering about 

 one-third of each tergmn; venter black with creamy-white spots 

 laterally on 3rd, 4th, and 5th sternites; pygidium oval with the apical 

 end trmicate. 



C. femurrubrum Viereck and Cockerell is very different from all 

 other species but in several structural characters is close to C. macro- 

 sticta Viereck and Cockerell. Both species have been known to use 

 Tenebrionidae as prey for their young. 



The males of C. femurrubrum Viereck and Cockerell show little 

 variation in color throughout the range of the species; however, the 

 females show two distinct color forms, which are recognized here as 

 separate subspecies. The reddish form has been found only from the 

 Colorado River area east. Since the type male of C. femurrubrum 

 Viereck and Cockerell is from Albuquerque, N. Mex., this reddish 

 form of female is placed under the subspecies femurrubrum femur- 

 rubrum Viereck and Cockerell. The black and yellow form of female 

 is taken almost exclusively in southern California. This is the color 

 form of the female described as C. athene Banks from Claremont, 

 CaUfornia. This is placed under the subspecies C. femurrubrum 

 athene Banks. 



Figures 51-53. — Localities of: 51, C. femurrubrum femurrubrum Viereck and Cockerell 

 (females only); 52, C. femurrubrum athene Banks (females only); 53, C. femurrubrum 

 Viereck and Cockerell (males only). 



Types. — The type male of C. femurrubrum Viereck and Cockerell, 

 from Albuquerque, N. Mex., June 30 (Cockerell), is at the Philadelphia 

 Academy of Natural Sciences, no. 10040. The type male of C. thione 

 Banks, from Colton, Calif. (Pilate), is at the Museum of Comparative 

 Zoology, Harvard, no. 23593. 



Distribution. — Southern Nevada, southern Utah, southern Colo- 



