152 PACIFIC COAST AVIFAUNA iNo. 14 



state, and a common migrant in tin- mountain valleys and at the edge of the 

 prairie region near the mountains. A rare migrant in the eastern part of thi 

 state. Breeds in the Canadian zone, in willow thickets along mountain streams 

 or bordering mountain lakes. West of the divide the Pileolated Warbler breeds 

 in arbor-vitae forests. The eastern limit of its breeding range, as far as known, 

 is marked by Teton and Lewis and Clark counties in the northern part of the 

 state (Saunders, 1914a, p. 142) and by Gallatin County (Saunders, 1911a, p. 47) 

 and Park County in the southern part. The species has not been reported in the 

 breeding season east of these points. The only records in eastern Montana are 

 from Fort Keogh, September 22, 1900 (Hedges, coll. h: B. Bishop), and from 

 Caster County, August 24, 1919 (Hedges, IMS). 



The migrations take place in late May and in August and Septemlier. In 

 tlie valleys, this warbler is most conspicuous during the fall migration. It be- 

 comes very abundant about the middle of August, remaining so till the first cold 

 weather, which comes about September 1, and stragglers are seen up to the mid- 

 dle of the month. Dates of spring arrival are : Great Falls, May 23, 1892 

 (Cooke, 1904a. p. 129) ; Bozeman, June 6, 1909; German Gulch, May 28, 1910; 

 Anaconda, May 14, 1911; Choteau, May 25, 1912; Bitterroot Valley, May 20, 

 1913 (Baile,y, MS) ; Belton, May W, 1914; Teton River, May 28. 1915 (DuBois, 

 -MS). Fall dates are: Great Falls, August 17. 1889 (Cooke, 1904a, p. 129) ; Bear 

 Can.you, Gallatin County, Augu.st 26, 1908: Mill Creek, Deer Lodge County, 

 September 14, 1909; Willow Creek, Powell County, September 17, 1910; Willow 

 Creek, Lewis and Clark Count.y, August 28, 1911 ; West Fork of Sun River, 

 Lewis and Clark County. August 26, 1912: Belton. September 15, 1915 (DuBois, 

 :\IS). 



The nest has been found twice in tlie state. One was discovered at Lakr 

 I\lacDonald, Missoula Count.y, June 24, 1901, which contained four eggs ad- 

 vanced in incubation (Silloway, 1901a, p. 34). A nest with five eggs was found 

 in Pipestone Basin, Jefferson County, June 16, 1910 (Saunder.s, 1910d, p. 199). 



296. Setophaga niticilla (Linnaeus) 



Redstart 



A summer resident throughout most of the state, but not reported from the 

 Bitterroot Valley. Breeds in the Transition and Upper Sonoran zones, in dense 

 thickets of willow and alder, particularly in the vicinity of water. Common at 

 low elevations, rather rare above 4000 feet in the northern part of the state, and 

 above 4500 in the southern part. Found throughout the Transition zone. About 

 Flathead Lake, breeds in areas of mixed evergreens and broad leaf trees, such 

 as Cottonwood and birch, mixed with fir and tamarack. 



Migrations take place in May and September. The average arrival at Terry 

 is May 16, at Great Falls, May 21. and at Columbia Falls. May 24 (Cooke, 1904;i, 

 p. 138) . Other dates are : Bozeman, Blay 27, 1909 ; German Gulch, Jlay 28, 1910 . 

 Silver Bow, jMay 21, 1911 ; Choteau, Jlay 22, 1912 ; Lewistown, May 17, 1903 

 (Silloway, 1903a, p. 65) : Belton, Jlay 30. 1914; Teton River, May 28, 1915, and 

 :\ray 21, 1916 (DuBois, IMS). Fall dates are: Great Falls, September 14, 18S9 

 (Cooke, 19()4a. p. 138) : Gold Creek. August 21, 1910. 



