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THE RAPTORIAL BIRDS OF IOWA 



Fig. 48. Iowa Broad-winged Hawk (Photo by Mr. Wesley F. Kubichek). 



12A. BUTEO PLATYPTERUS IOWENSIS Sub-sp. Nov. 

 Iowa Broad-winged Hawk. 



Field Characters. A medium-sized hawk appearing entirely black. 

 It may be seen together with the ordinary Broad-winged Hawks. 



Description. Feathers of the entire bird in general sooty brown 

 with a slightly rufous cast, the back and top of the head somewhat 

 darker. Concealed bases of head and nape feathers snow white. Lin- 

 ing of wings in general same color as body. Whitish barring no- 

 ticed on the under surface of primaries and secondaries. Exposed 

 surface of tail with three dark bars, and two narrower grayish white 

 bars, and narrow whitish tip. 



Immature: With more rufous, especially on breast; tail crossed 

 by five dark and four slightly lighter bars ; tail lighter below. 



