122 PACIFIC COAST AVIFAUNA No. 14 



Gallatin Valley, one bird, Jnne 8, 1915 (Lundwall, MS) ; Miles City, September 

 26 and 30, 1919 ( Pledges) . 



2:i'S. Spizella monticola ochracea Brewster 



Western Tree Sparrow 



An abundant migrant and eommon winter visitor in valleys and on prairies 

 throughout the state. Reported by all observers who have done work during 

 migrations or in winter. Occurs in grass lands or brush areas in the mountains 

 in migrations, but not in winter. 



The migrations of the Western Tree Sparrow are generally in October and 

 April, but in the mountains it often appears early in September, and sometimes 

 remains till IMay. In Custer and Dawson counties it is reported only in migra- 

 tions, and not in winter (Cameron, 1908a, p. 40). .Migration dates are as fol- 

 lows: Fall arrival: Terry, average of two years October 16, earliest, September 

 26, 1896 (Cooke, 1909c, p. 254) ; taken in Bridger Mountains early in September 

 (Grinnell, 1876, p. 645); Bear Creek, Gallatin County, September 11, 1908; 

 Three Forks, October 17, 1909; Race Track, Deer Lodge County, October 30, 

 1910; Choteau, October 1, 1911; Belton, September 25, 1915; Button, October 

 11, 1915 (DuBois, MS) ; Great Falls, October 10, 1915 (Kittredge, MS). Spring 

 departure: Big Sandy, average of two years March 16, latest ]May 9, 1907; 

 Columbia Falls, March 25, 1894 (Cooke, 1909c, p. 254) ; Sixteen Mile Creelc, 

 Gallatin County, April 23, 1909; Helena, April 9, 1911; Collins, Teton County, 

 April 3, 1912; Bitterroot Valley, March 26, 1912; April 5, 1913 (Bailey, MS) ; 

 Highwood, March 28, 1914; Button, April 1, 1915, April 3, 1916 (DuBois, MS) : 

 Missoula, March 25 (Kittredge, MS). 



One record appears to be m July, though the date is not given. A few were 

 reported as seen between Fort Custer and Terry, and a specimen taken (MeChes- 

 ney, 1879, p. 2387). From the dates of other specimens taken, and reported 

 upon in this work, this must be a summer record, a decidedly unusual occur- 

 rence if the record is authentic. 



234. Spizella passerina arizonae Coues 



Western Chipping Sparrow 



A common summer resident throughout the state. Breeds commonly in 

 mountains, in mountain valleys, and in the prairie region, in pine hills and '-ot- 

 tonwood groves of the Transition zone, and in Douglas fir or lodgepole pine for 

 ests of the Canadian. Reported by observers from all localities in the state. 

 Less common in cotton wood groves of the prairie region than elsewhere, but «till 

 very numerous; often abundant in the mountains. 



Tlie migrations take place mainly in May and September. At Columbia 

 Falls th(! average of four years is May 9 and the eai'liest April 26, 189-1. At 

 Terry the average of four years is .May 10, earliest iMay (i. 1893 (Cooke, 1909c, 

 p. 257). Other dates of arrival are: Bridger Creek, Gallatin County, Mi\y 21. 

 1909; Divide Creek, Silver Bow County, May 8, 1910; French Gulch, Deer 

 Lodge County, May 5, 1911 ; Choteau, :\lay 18, 1912; Bitterroot Valley, May 20. 



