Jan., 1909, Birds of Illinois and Wisconsin — Cory. 463 



white on the plumage ; the head, sometimes almost white; under parts, 

 white; tail, pale rufous, sometimes but not always showing the dark 

 subterminal bar. Size of B. borealis. 



This western form is casual or accidental in Illinois and Wiscon- 

 sin. Mr. H. K. Coale records a specimen taken near Halfday, Illinois 

 (Auk, 1885, p. 109), and states that it was shot near the Desplaines 

 River, thirty miles northwest of Chicago, July 25, 1876. Kumlien 

 and Hollister (Birds of Wisconsin, 1903, p. 63) record a specimen 

 shot by Mr. J. N. Clark at Meridian, Dunn Co., Wisconsin, Oct. 22, 

 1892, and state that three others have been taken at Lake Kosh- 

 konong during the past few years. 



158b. Buteo borealis calurus (Cass.). 



Western Red-tailed Hawk. 



Distr.. "Western North America, from the Rocky Mountains to 

 the Pacific, south into Mexico; casual east to Illinois." (A. O. U.) 



Adult birds differ in having the plumage very dark, sometimes 

 sooty, except the tail which is rufous. Some specimens have the 

 general plumage dark and the whole breast rufous brown, the tail 

 showing one or more black bars. Measurements the same as B. 

 borealis. 



Stragglers occasionally occur in both Illinois and Wisconsin. Mr. 

 Nelson states : "In my collection is a fine adult specimen of this variety 

 obtained near Chicago in April, 1873, by my friend, Mr. C. H. Smith." 

 (Birds of N. E. Illinois, 1876, p. 119.) Mr. Charles K. Worthen 

 writes me it has been taken near Warsaw, Illinois. Kumlien and 

 Hollister consider it rare, "but of regular occurrence in Wisconsin in 

 the late fall. Six or eight specimens were procured about Lake 

 Koshkonong by Thure and L. Kumlien." They also record a speci- 

 men from Delavan killed Oct. 19, 1901, and another taken by Mr. 

 J. N. Clark at Meridian, Oct. 23, 1893. 



158c. Buteo borealis harlani (Aud.). 

 Harlan's Hawk. 



Distr. : Ranges from Gulf states north to Iowa, Kansas, and Missis- 

 sippi Valley; casual east to Pennsylvania; south in winter to Cen- 

 tral America. 



Special characters : A very dark form. Adult birds have the head 

 and neck sooty brown, often streaked with whitish; the general 

 plumage above is dark sooty, sometimes almost black, but showing 



