\ 



1921 BIRDS OF MONTANA 65 



overhead, evidently migrating, for they were all flying southeast against a strong 

 wind. 



The only specimen definitely identified as to subspecies, so far as I know, 

 is one from the South Fork of the Flathead River (Saunders, 1914a, p. 132). 



119. Falco rusticolus nisticolus Linnaeus 



Gray Gyrfalcon 



One record only. One seen at Collins, Teton ('oiuity, January 8, 1912 

 (Saunders, 191 -la, p. 182). 



120. Falco mexicaims Schlegel 



Prairie Falcon 



A rather rare permanent resident throughout the state. Apparently only 

 a summer resident in most places. Records west of the continental divide are 

 few. 



Summer and nesting records : Two Forks of the Milk River, nest and young, 

 July 18, 1874 (Coues, 1874b, pp. 621-622, and 1874a, p. 596) ; Cone Butte, in 

 Judith Mountains, not common (Grinnell, 1876, p. 649) ;. various localities 

 along the Upper Missouri (Hayden, 1862, p. 152) ; several specimens from the 

 Upper Missouri and Yellowstone (Baird, 1858, p. 12) ; Custer County, perma- 

 nent resident, nesting in the badlands, two eggs May 10, 1906 (Cameron, 1907, 

 pp. 265-266) ; Gallatin County, rare summer resident (Saunders, 1911a, p. 36) ; 

 Gold Creek, Powell County, July- August, 1910 (Saunders, 1912a, p. 25) ; Teton 

 County, summer resident on prairies (Saunders, 1914a, p. 132) ; Wild Horse 

 Island, Flathead Lake, July 2, 1914 (Saunders, 19151), p. 112) ; Bitterroot Val- 

 ley, rare in winter, one taken January 10, 1911, one seen January 15, 1912 

 (Bailey, MS). 



121. Falco peregrinus anatum Bonaparte 



Duck Hawk 



A rather rare summer resident throughout most of the state ; perhaps in 

 some localities a permanent resident. Records are almost lacking west of the 

 continental divide, and the bird appears to be, on the whole, commoner east- 

 ward in the prairies. 



Nesting records: Ne.st and young at Two Forks of ^lilk River, July 17. 

 1874 (Coues, 1874b, p. 622) ; nests and young along ^iMissouri (Grinnell, 1876, p. 

 649) ; nest on Squaw Creek, Gallatin County (Saunders, 1911a, p. 36) ; nests 

 on cliffs along the Yellowstone near Billings (Thomas, MS). 



Migration dates: Spring: Gallatin Valley, April 17, 1909; German Gulch, 

 Silver Bow County, March 23, 1910; Anaconda, April 23, 1911 (Saunders, 1910a, 

 p. 132). Fall; Rock Creek, Park County, October 26, 1908. Cameron records 

 the bird as resident in Custer and Dawson counties so it evidently occurs there 

 in winter. Deer Lodge and Silver Bow counties are the only points where it 

 has been recorded on the w^est side of the divide. 



