176 Birds of Colorado 
subterminal bar; below almost entirely white with sometimes u few 
brown, spots 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 
Dille found a nest and three eggs, May 24th, in Weld co., west of Greeley. 
There are two young Red-tails in the Colorado College Museum, 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 harlant. 
A.O.U. Checklist no 337d—Colorado Records—Ridgway 84, p. 253, 
85, p. 165 ; Cooke 97, p. 75. 
Description. Resembling B. 0. calurus, but with the tail confusedly 
and irregularly mottled with greyish, 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; Gilman 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 the inner 
web; below throat and belly white, contrasted with a reddish-brown 
chest-band; the under-parts sometimes washed and mottled with 
chestnut to varying extent ; iris brown, bill black, cere and legs greenish- 
yellow. Length 18; wing 14.5; tail 7.5; culmen 1.2; tarsus 2.6. 
