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86 PACIFIC COAST AVIFAUNA No. 14 



dates are Lewistown, April 12, 1901 (Silloway, 1903a, p. 38) ; Choteaii, April 28. 

 1912 (Saunders, 1914a, p. 134) ; Dutton, April 18, 1915, April 22, 1916, and 

 April 24, 1917 (DuBois, ]\IS). 1 can find no dates of fall migration. 



This species begins nesting in the latter part of May, and usually raises 

 t\\o lu'oods in a season, the second brood, under normal conditions, starting early 

 in .Inly. Nests containing eggs were found at Crooked Falls of the Missouri, May 

 21, 1888, and June 3, 1889, by Williams (Bendire, 1895, j). 278). A nest con- 

 taining young was found at Choteau, June 21. 1911, the young flying about July 

 4. The same nest the following year contained seven eggs of the first laying. 

 Incubation began May 21, 1912-, the eggs hatched June 4, and the young left the 

 nest June 23. The second brood was started with three eggs by July 2 (Saun- 

 ders, 1914a, p. 134). A nest with six eggs was found at Dutton, June 18, 1915, 

 and a nest containing young, June 23, 1916 (DuBois, MS). 



173. Nuttallomis borealis (Swaiuson) 



Olive-sided Flycatcher 



A summer resident of the mountains in tlic western half of the state. Not 

 common but widely distributed. Breeds mainly in the Canadian zone, preferring 

 mountain slopes that are mainly open grass land with scattered clumps of 

 Douglas fir, or land that has been denuded of all but a few clumps of trees by 

 forest fires. While the bird is not common, the loud whistle of tlu^ male, coming 

 from his perch in the dead top of a fir, carries for a long distance and proclaims 

 his presence. The easternmost records of the species in summer are the moun- 

 tains of Teton and Lewis and Clark counties (Saunders, 1914a, p. 134), the Belt 

 ^Mountains (Williams, 1882a, p. 62), and Traill Creek, Park County (Richmond 

 and Knowlton, 1894, p. 304). West of these points, most observers in the moun- 

 tains record the presence of this species. 



In migration this bird occurs rarely in the i)rairie region, It arrives in 

 early June, and there are three records of its occurrence east of the mountains. 

 These are ^liles City, June 8, 1902, taken by C. F. Hedges and in the collection 

 of the University of .Montana; Miles City, August 19, 1919 (Hedges) ; and Cho- 

 teau, Ma.y 26, 1912, one taken (Saunders, 1914a, p. 131). ^ligration records in 

 the mountains are as follows: Columbia Falls, May 21, 1897 (Cooke, 1908, p. 

 258) ; Bridger Creek, Gallatin County, June 4, 1909; Bernice, Jefferson County, 

 June 8, 1911 ; Belton, June 9, 1914 (DuBois, MS). German Gulch, Silver Bow 

 County, May 31, 1910. Fall migration probably takes place in August or Sep- 

 tember. The only September dat(> I have is from .Mill Creek, Deer Lodge County. 

 September 5, 1909. 



There is no doubt that this species breeds in the iiioiintnins, hut there ai'e no 

 published records of the finding of the nest or of the young. 



174. Myiochanes richardsoni richardsoni (Swaiuson) 



Western Wood Pewee 

 A eomiiion sunnuei- I'esideul throughout the state in cottonwood gi-oves or in 

 the o])en yellow pine forests of the Transition zone. Recorded by all observei's 



