86 PACIFIC COAST AVIFAUNA No, 14 



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

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

 April 24, 1917 (DuBois, MS). I can find no dates of fall migration. 



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

 two hinods in a season, the second brood, under normal conditions, starting early 

 in July. Nests containing eggs were found at Crooked Falls of the ilissouri, Jlay 

 21, 1888, and June 3, 1889, by Williams (Bendire, 1895, p. 278). A nest i-on- 

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

 4. Tlie 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 Button, June 18, 1915, 

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



173. Nuttallomis borealis (Swainson) 



Olive-sided FiiYc.vTciiER 



A summer resident of the mountains in the 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 

 Bouglas 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 the 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 tliese twints, 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 Miles City, June 8, 1902. taken by C. F. Hedges and in the collection 

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

 teau, May 26, 1912, one taken (Saunders, 1914a, p. 134). Migration 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 (BuBois, MS). German Gulch, Silver Bow 

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

 tember. The only September date I have is from Mill Creek, Beer Lodge County. 

 September 5, 1909. 



There is no doubt that tliis spci'ies breeds in tlie mountains, but there are no 

 jiublislied i-eeords of the finding of tlie nest or of the young. 



174. Myiochanes richardsoni richardsoni (Swainson) 



Western Wood Pewee 

 A comiuon summer resident throughout tlu' state in I'ottonwood groves or in 

 the ()|)eii yellow pine forests of the Ti-ansition /.one. Recorded by all observers 



