1874.] 65 [Allen. 



90. Archibuteo ferrugineus Gray. Western Rough-legged 

 Hawk. 



Next to Falco sparverius, the most common species of the Falcon- 

 idce\ yet it was seen only at distant intervals. Several nests were 

 found containing young. The nest is often a very large, bulky struc- 

 ture, sometimes three or four feet in diameter, built of coarse sticks, 

 mixed with the ribs of antelopes and buffalos. It is placed on the 

 ground or rocks, usually near the summit of isolated buttes. The 

 same nest is apparently occupied for a series of years * and annually 

 repaired. 



91. Aquila chrysaetos Linn. Golden Eagle. 

 Occasional. A young one was captured by some soldiers of the 



7th Cavalry on Heart River. 



92. Haliaetus leucocephalus Savig. White-headed Eagle. 

 Bald Eagle. 



Seen only at rare intervals along the Yellowstone and Musselshell 

 Rivers. 



CATHARTIDiE. 



93. Cathartes aura 111. Turkey Buzzard. 



Seen at intervals all the way from the Missouri to the Yellowstone, 

 rarely more than two or three together, and generally singly. Quite 

 a number, however, finally assembled around Camp Thorne, attracted, 

 doubtless, by the offal from the beeves slaughtered for the support of 

 the garrison stationed there during the absence of the main expedi- 

 tion up the Yellowstone. 



COLUMBID^. 



. 94. Zengedura carolinensis Bon. Carolina Dove. 



Abundant everywhere, particularly near the streams. A few nests 

 met with, which were invariably placed on the ground. 



TETRAONIDiE. 



95. Centrocercus urophasianus Sab. Sage Cock. Cock- 

 of-the-plains. 



More or less common along the Yellowstone and Musselshell 

 Rivers, but large flocks met with only a few times. None seen east 

 of the Little Missouri. 



PROCEEDINGS B. S. N. H. — VOL, XVII. 5 NOVEMBER, 1874, 



