GEOLOGICAL SURVEY OF THE TEERITOEIES. 

 (Sub-family Accipitrinw, the Raid's.) 

 Acclpiter fuscus, Bouap., (sharp-shiuned liawk :) 



697 



Hab. — Throughout North America and Mexico. 



This species was only met with in the Lower Geyser Basiu, where it 

 was quite common. 



(Sub-family Bufeonincv, tJie BuzzardhmvJcs.) 

 Buteo swainsoni, Bonap., (Swaiuson's hawk :) 



Hah. — Western North America ; accidental in New England. ^ 



This species, thoijgh not at all numerous, was the most abundant 

 species of hawk along our route. On the 9th of July I obtained one of 

 their nests at Lincoln Valley, near Fort Hall, Idaho Territory. It was 

 found on a scrub-cedar on a side hill, about nine feet above the ground, 

 and was composed of sticks, lined with fine strips of inner bark ; it Avas 

 nearly flat, and measured twenty-seven inches in external diameter b}' 

 ten in thickness ; it contained one young bird and one egg-, the egg — 

 which coutained a full-grown embryo, which was dead and partly de- 

 composed — was white, and measured 2^^- inches in length by 1^ in 

 breadth. 



Buteo montanns, Nuttall, (western red-tail :) 



Hah. — Western North America. 



This western representative of B. horealis was only met with in Teton 

 Canon, where I saw but one pair, the female of which I secured. 



