1921 BIRDS OF MONTANA 165 



toiler 2, 1001) : Wai-iii Springs Creek. Deer Lodge County, Cetolier 14, 1!)1(). Date 

 of arrival at winter (juarters in Custer County is September I), IDOti, and dale 

 of departure April 16, 1!H)6 (Cameron, 1908a, p. 54). 



Winter records are: Great Falls (Williams, lS90a, p. 98) ; Custer and Daw- 

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

 ivgularly at Lombard, Gallatin County (Saunders, 1911a, p. 48) ; one al P.o;:e- 

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

 vallis, March 10, 1911. January 15, 1912, and December 26, 191-> i iiailey, .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. 1 have s<'en it 

 in the Glacier National Park in the summers of 1914 and 1915, a recoi'd tiiat has 

 not been i)reviousl.v i)ublished. 



321. Hylocichla fuscescens salicicola Ridgway 



Willow 'riiursu 



A i-egular summer resident of the western half of the state, occurring also, 

 though rarel.v, 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 moiin 

 tain valleys, and in the foothills and lower mountain canyons. Pound 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 IMiles 

 City and Fort Keogh, .May 11, 18 and 25, 1902 (Hedges, coll. Cniv. .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; .Vuaeonda. June 5, 1911 ; Choteau. June 

 ", 1912. Fall dates are: Bozeman. .\ugiist 24. 1908; (Johl Civck. .August 27, 

 1910. In the BitteiToot Valley it arrived .May S, i:)i:i (Bailey. .MS). 



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

 J901. with eggs advanced in incubation in each case (Silloway. 1901a. pp. 12 and 

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

 1903a, p. 69). 



322. Hylocichla aliciae aliciae (Baird) 



Gray-cheeked Tiirush 

 A migrant in extreme eastern Montana in .^lay. .\ot known in fall. <.)ne 

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

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



323. Hylocichla ustulata swainsoni (Tschudii 



Olive-b.\cked Thrush 

 A common sinumci resident in the mountains througliout the western half 

 of the state. Verv abundant on tiie west side of the continental divide, whei'e 



