88 



THE RAPTORIAL BIRDS OP IOWA 



7A. ASTUR ATRICAPILLUS STRIATULUS (Ridgway). 334a. 



Western Goshawk. 



Field Characters. Scarcely distinguishable from the Goshawk ex- 

 cept at very close range. 



Description. Adults dark lead color or blackish on the head and 

 back. Whitish below with dark slate colored bars which are heavier 

 and darker than in the Goshawk. 



Immature with brownish black backs. Beneath heavily striped 

 with dark slate, and with dusky spots on the thighs. 



Measurements. As in the Goshawk. 



Range. Northern part of the Pacific coast. South in winter to 

 California, and casually eastward to Iowa and Illinois. 



Fig. 31. Map showing the distribution in Iowa of the Western Goshawk. 



The western form of the Goshawk, first recognized by Mr. Ridg- 

 way, has not been hitherto reported from Iowa, although Dr. C. B. 

 Cory mentions a specimen taken by Mr. Chas. K. Worthen near 

 Warsaw, Illinois. Two specimens of the Western Goshawk have 

 been secured in Iowa during the winter of 1916-17; one by Mr. Wes- 

 ley Kubichek at Iowa City, and the other was shot by Mr. Joseph 

 Shellhorn near Cedar Rapids. Both birds are adult. 



