Dad RECONNAISSANCE FROM CARROLL, MONTANA, 
82. NISUS FUSCUS, (@m.) Kaup. 
SHARP-SHINNED HAWK. 
This species was seen but twice; one specimen having been taken on the shores of the Yellow- 
stone Lake, and another observed in the Lower Geyser Basin. 
83, NISUS COOPERIL, (Bp.) Ridgway. 
CooPER’s Hawk. 
A single individual of this species was seen while we were ascending the Missouri. 
84. FALCO LANIARIUS POLYAGRUS, (Cass.) Ridgeway. 
AMERICAN LANNER FALCON, 
This species, although not common in the country through which we passed, was occasionally 
seen, and no doubt bred on the mountains. I felt quite sure that a pair had a nest on Cone Butte, 
but was unable to find it. While at Camp Baker, a bird of this species used to fly over our camp 
every morning to a corral just beyond, where he would secure a blackbird or two for breakfast, and 
then return to the mountains. 
85. FALCO COMMUNIS ANATUM, (Gm.) Ridgicay. 
Duck Hawk. 
While ascending the Missouri, we several times saw the nests of this species placed on little 
ledges of the high washed clay bluffs by which the river is bordered. These nests all contained 
untfledged young. One or both of the parents was always to be seen sitting near the nest. This 
species was abundant in the valley of the Yellowstone above Emigrant Peak, and had no doubt 
bred there, as I took a very young bird, 
86. FALCO COLUMBARIUS (?) RICHARDSONYI, (Linn.) Ridgway. 
MIGHARDSON’S FALCON. 
A Pigeon awk, probably to be referred to this variety, was seen September 5, hovering low 
over the summit of the Bridger Mountains. 
87, FALCO SPARVERIUS, Linn. 
Sparrow Hawk. 
Abundant on the plains and along the Yellowstone River. 
88. BUTEO BOREALIS, (@m.) Vieill. 
RED-TAILED HAWK. 
Seen on several occasions on the Missouri River. 
89. BUTEO BOREALIS CALURUS, (Gm.) Cass. 
WESTERN RED-TAILED HAWK. 
This was the most common hawk seen in the mountains. We must have seen fifteen or twenty 
the day that we passed through Bridger’s Pass; and they were equally abundant in some parts 
of the Yellowstone Park. 
90. BUTEO SWAINSONI, Bp. 
Swarnson’s HAWK. 
Rather numerous in the valley of the Yellowstone. 
