1921 BIRDS OF MONTANA 165 



tober 2, 1909 ; Warm Springs Creek, Deer Lodge County, October 14, 1910. Date 

 of arrival at winter quarters in Custer County is September 9, 1906, and date 

 of departure April 16, 1906 (Cameron, 1908a, p. 54). 



Winter records are: Great Falls (Williams, 1890a, p. 98) ; Custer and Daw- 

 son counties, uncommon in winter in badlands (Cameron, 1908a, p. 54) ; winters 

 regularly at Lombard, Gallatin County (Saunders, 1911a, p. 48) ; one at Boze- 

 iiian, December 25, 1911 (Saunders, 1912h, p. 43) ; Bitterroot Valley at Cor- 

 vallis, March 10, 1911, January 15, 1912, and December 26, 1912 (Bailey, MS). 



There are no records of the finding of a nest in the state, although it is found 

 all summer in the mountains and undoubtedly does breed there. I have seen it 

 in the Glacier National Park in the summers of 1914 and 1915, a record that has 

 not been previously published. 



321. Hylocichla fuscescens salicicola Ridgway 



Willow Thrush 



A regular summer resident of the western half of the state, occurring also, 

 though rarely, in the eastern part, in migrations at least. Breeds in the Transi- 

 tion zone in thickets of willows along streams or about lakes, in the higher moun 

 tain valleys, and in the foothills and lower mountain canyons. Found breeding 

 east to the Belt Mountains (Williams, 1890b, p. 292), to Fergus County (Sillo- 

 way, 1903a, p. 69), and, in the southern part of the state, at least to Park County. 

 The only migration records from the eastern part of the state are from Allies 

 City and Fort Keogh, May 11, 18 and 25, 1902 (Hedges, coll. Univ. Montana) 

 and from Custer County, August 28, 1919 (Hedges). 



The migrations take place in late May or June, and in August or Septem- 

 ber. In the Belt ]Mountains the Willow Thrush arrives about May 15 ; the latest 

 fall date is September 7. Other dates are : Bozeman, May 29, 1909 ; Pipestone 

 Basin, Jefferson County, June 5, 1910; Anaconda, June 5, 1911; Choteau, June 

 ~, 1912. Fall dates are: Bozeman, August 24, 1908; Gold Creek, August 27, 

 1910. In the Bitterroot Valley it arrived May 8, 1913 (Bailey, ^IS). 



The nest has been found at Flathead Lake, June 29, 1900, and June 16, 

 1901, with eggs advanced in incubation in each ease (Silloway, 1901a, pp. 12 and 

 33). A nest was found in Fergus County, Jvine 8, 1901, with two eggs (Silloway. 

 1903a, p. 69). 



322. Hylocichla aliciae aliciae (Baird) 



Gray-cheeked Thrush 

 A migrant in extreme eastern Montana in May. Not known in fall. One 

 taken at Fort Keogh, May 18, 1889 (Thorne, 1895, p. 218), and one in Dawsou 

 County, May 13, 1904 (Cameron, 1908a, p. 54). 



323. Hylocichla ustulata swainsoni (Tschudi) 



Olive-backed Thrush 

 A common summer resident in the mountains throughout the western half 

 of the state. Very abundant on the west side of the continental divide, where 



