176 Birds of Colorado 



eubterminal bar ; below almost entirely white with sometimes a few 

 brown sj^ots across the belly. In a young bird the tail has a whitish 

 wash, and is crossed by the usual 10 to 12 narrow transverse bars. 



Distribution. — The Great Plains of middle America from Minnesota 

 and Iowa south to Texas. 



This, a very pale form of the Red-tail, seems to occur on the eastern 

 plains and foothills of Colorado. Cooke gives it as a resident since 

 DiUe found a nest and three eggs, May 24th, in Weld co., west of Greeley. 

 There are two young Red-tails in the Colorado College Museiun, which 

 seem to be referable to this subspecies, one taken by Aiken near 

 Colorado Springs, September 27th, 1902, the other shot by J. F. Baker 

 at Manitou Park, August 29th, 1906. 



Harlan's Hawk. Buteo borealis harlani. 



A.O.U. Checklist no 337d— Colorado Records— Ridgway 84, p. 253, 

 85, p. 165 ; Cooke 97, p. 75. 



Description. — Resembling B. b. cahnus, but with the tail confusedly 

 and irregularly mottled with grej'ish, rusty, white and dusky, crossed 

 near the end with a subterminal band of black, and tipped with white ; 

 upper-parts sooty to black ; lower -parts varying from sooty to white, 

 but rarely if ever with tawny or ochraceous. 



Distribution.^ — The Gulf States and lower Mississippi Valley, casually 

 north to Kansas, Iowa and Pennsylvania. 



A Hawk obtained by Aiken in El Paso co. some time before 1875, 

 was referred by Ridgway to this subspecies. I have not been able to 

 trace this specimen in the Aiken collection. 



Swainson's Hawk. Buteo swainsoni. 



A.O.U. Checklist no 342— Colorado Records— Baird 54, p. 11 ; 58, 

 p. 19 ; Henshaw 75, p. 421 ; Allen & Brewster 83, p. 197 ; Drew 85, 

 p. 17 ; Dille 87, p. 97 ; 03, p. 74 ; Morrison 88, p. 116 ; 89, p. 7 ; Fisher 

 93, p. 72 ; Lowe 94, p. 267 ; Cooke 97, pp. 75, 204 ; Henderson 03, 

 p. 107 ; 09, p. 229 ; Markman 07, p. 156 ; Gihnan 07, p. 154 ; Rockwell 

 08, p. 162. 



Description. — Male in normal phase — Above dusky-brown with often 

 paler but never tawny edges to the feathers ; upper tail-coverts banded 

 with white ; tail slaty or brown, with a narrow bar of black ; wings 

 with the three outer primaries only , narrowed or cut out on tho inner 

 web ; below throat and belly white, contrasted with a reddish-brown 

 chest-band ; tho im.der-parts sometimes washed and mottled with 

 chestnut to varying extent ; iris brown, bill black, cere and logs greenish- 

 yellow. Length 18 ; wing 14.5 ; tail 7-5 ; culmen 1-2 ; tarsus 2-6. 



