Jan., 1909. Birds of Illinois and Wisconsin — Cory. 



549 



American Crow. 



grayish green, thickly marked with different shades of dull brown, 

 and measure about 1.64 x 1.20 inches. The Field Museum collection 

 contains a number of sets of eggs taken in northern Illinois between 

 April 17 and May 19. 



Genus NUCIFRAGA Brisson. 

 Subgenus PICICORVUS Bonap. 

 222. Nucifraga columbiana (Wils.). 

 Clarke's Nutcracker. 

 Disir.: " Higher coniferous forests of western North America, 

 from the eastern slope of the Rocky Mountains to the Pacific, and 

 from Putnam River, Alaska, south to Arizona and northern Lower 

 California. Accidental in Kansas, Missouri and Arkansas," (A. O. U.) 

 Wisconsin. 



Adult: General plumage, pale ashy gray; dull white on forehead, 

 chin and about the eyes; primaries and middle tail feathers, black, 

 more or less tinged with blue black; tips of secondaries and outer 

 tail feathers, white; bill, black. 



Length, about 12.50; wing, 7.50; tail, 5.20; bill, 1.40. 



