Jan., 1909. Birds of Illinois and Wisconsin — Cory. 469 



Genus ASTURINA Vieill. 



162. Asturina plagiata Schlegel. 

 Mexican Goshawk. 



Distr. : Mexican species, ranging from southwestern United 

 States throughout Mexico and Central America to Panama. Casual 

 or accidental as far east as Illinois. 



Special characters, adult: Upper plumage, slaty gray; upper tail 

 coverts, white; under parts, gray, the feathers banded with white, 

 giving a barred appearance to the entire under parts; a broad white 

 band on the tail and also a second white band narrower and more im- 

 perfect; wing, 9.40 to 11.75, always less than 12.25; tail, less than 

 8.25 inches long. 



Immature: Upper plumage, brown; upper tail coverts, white; 

 tail, grayish brown, w4th numerous dark brown bands; under parts 

 white, the feathers of the breast and belly marked with large dark 

 brown spots; flanks barred with dark brown; wing, 9.40 to 11.75, 

 always less than 12.25 inches long; tail, less than 8.25 inches long, 

 usually about 7.50 inches. 



The only known record of the occurrence of this species in Illinois 

 is that of Prof. Ridgway (Orn. of Illinois, p. 463), which is as follows: 



"A specimen of this tropical species was seen by the writer on 

 Fox Prairie, in Richland Co., on the 19th of August, 187 1. It several 

 times came so near that its peculiar markings could be seen with per- 

 fect distinctness and, the writer having previously handled many 

 stuffed specimens, there cannot be the slightest doubt as to the cor- 

 rectness of its identification." Mr. R. M. Anderson records a pair 

 of these birds taken by Mr. Walter G. Savage in Van Buren Cotmty, 

 Iowa, May 25, 1895. (Birds of Iowa, 1907, p. 251.) 



Genus ARCHIBUTEO Biehm. 



163. Archibuteo ferrugineus (Light.). 

 Ferruginous Rough-legged Hawk. 



Distr.: North America, chiefly w^est of Mississippi Valley, breed- 

 ing from Utah northward; south in winter to Mexico; casually as 

 far east as Illinois. 



Special characters : Entire front of tarsus thickly feathered. This 

 species occurs in both light and dark phases of plumage, the former 

 the more common; but the feathering of the tarsus and its size are 

 good diagnostic characters. 



