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PROCEEDINGS OF THE NATIONAL MUSEUM 







d 



Figure 15. — a, b, Dorsal view of pronotum, with grid to show extent of constriction: a, M. 

 spretus, male, Pueblo, Colo.; J, M. bilituratus vulturnus, Wellington, Kans. c, d. Lateral 

 view of: c, M. bilituratus vulturnus, Wellington, Kans.; d, M. spretus, male, Pueblo, Colo. 



