1921 BIRDS OF MONTANA 



81 



V 



Spring: Sedan, Gallatin County, June 12, 1909; Homestake, Jefferson County, 

 June 2, 1910; Bozeman, May 28, 1911 ; Choteau, June 7, 1912 ; Bitterroot Valley, 

 June 11, 1910; May 31, 1911; June 4, 1912, and June 4, 1913 (Bailey, MS) ; 

 Button, June 18, 1915, and June 19, 1916 (DuBois, :\1S) ; Missoula, May 29 

 (Kittredge, IMS) ; Johnson Lake, Valley County, June 3, 1910 (Oberholser, 1914, 

 p. 50). Fall: Bozeman, August 31, 1908; Jefferson River, August 25, 1909; 

 Bozeman, September 5, 1910; Sun River, August 28, 1911; Choteau, August 29, 

 1912; Belton, September 3, 1915 (DuBois, MS) ; Missoula, September 15 (Kitt- 

 redge, MS). 



The nest of this species has been found very frequently, and there are many 

 published records of taking of the eggs, or finding of young. These indicate 

 that the birds begin nesting late in June, and continue until early in Augast. 

 The earliest date of taking eggs is Flathead Lake, June 26, 1902 (Silloway, 1903'), 

 p. 298) ; the latest. Poison, July 27, 1915. Newly hatched young have been 

 found in Powell County as late as August 6, 1910 (Saunders, 1912a, p. 26). 



162. Chordeiles virginianus sennetti Coues 



Sennett Nighthawk 



A common summer resident of the eastern part of the state, in the prairie 

 region, probably intergrading westward with Jiesperis. Probal)ly occurs far- 

 ther west in migrations. Records wiiere this form has been definitely identified 

 are as follows: Fort Custer, common (Mearns, 1904, p. 20) ; Fort Keogh, June 

 3, 1889; Darnell's Ranch, 30 miles south of Glasgow, Dawson Count}^ July S, 

 1910; Strater, Phillips County, July 16 and 18, 1910 (Oberholser, 1914, p. 56). 



The migrations and nesting of this form take place at about the same time 

 as those of lies peris. The earliest date for eggs is from Fort Benton, about June 

 25, 1860 (Cooper, 1869b, p. 297), and the latest date, August 13, 1860 (ibid., p. 

 298). It is interesting to note that among early records the eggs w'ere taken on 

 the Milk River, July 1, 1874 (Coues, 1874b, p. 613), and on the Upper Missouri 

 the same day and year (Grinnell, 1876, p. 647). This form has been taken west 

 of the continental divide in migration on Gold Creek, Powell County, August 26, 

 1910 (Saunders, 1912a, p. 27). 



163. Chaetura pelagica (Linnaeus) 



Chimney Swift 

 A rare summer resident of extreme eastern Montana. Seen at the mouth of 

 Tongue River (Allen, 1874, p. 62). Merrill (1897, p. 355), discussing C. vauxi, 

 says "I have frequently seen swifts on the Yellowstone River in Montana, but 

 have been unable to secure any for identification". Four seen at Miles City, 

 May 20, 1917 (Kittredge, MS). Two taken in Custer County, July 17 and 27, 

 1919, by C. F. Hedges. 



164. Chaetura vauxi (J. K. Townsend) 



Vaitx Swift 

 A rare summer resident of northwestern Montana, uiainly west of the con- 



