1921 BIRDS OF MONTANA 81 



Spring: Sedan, Gallatin County, June 12, 1909; Honiestakc, Ji-riVrson County, 

 June 2, 1910; Bozemau, ilay 28, 1911; Choteau, June 7, 1912; Bittcrroot Valley, 

 June 11, 1910; .May :n, 1911; June 4, 1912, and June 4, 191:} (Bailey, .MS); 

 Dutton, June 18, 1915, and June 19, 1916 (DuBois. lAIS) ; .Alissoula, .May 29 

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

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

 Bozeman, September 5, 1910; Sun River, August 28, 1911 ; Cliott-au, .\ugust 29, 

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

 redge, MS). 



The nest of this species has been found very frecpieutly, 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 .\ngast. 

 The earliest date of taking eggs is Flatiiead Lake, June 26, 1902 (Silloway, 1903b, 

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

 found in I'owell Count.v as late as August 6, 1910 (Sainiders, 1912a, {). 2(i). 



162. Chordeiles virginianus sennetti Coues 



SeNNETT NlGilTILWVK 



A conmion sunuuer resident of the <'astern part of the state, in \hr jD'aii'le 

 region, probably intergrading westward with Insinris. Probably occurs I'ai- 

 ther west in migrations. Records where this form has been definitely idcntifieci 

 are as follows: P"'ort Custer, eonunon (^learns, 1904, p. 20) ; Fort Keogh, June 

 3, 1889; Darnell's Ranch. 30 miles south of Glasgow, Dawson County, 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 liesi^cris. 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 were taken on 

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

 the same day and year (Grinnell, 1876, ]>. 647). Tiiis 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) 



ClII.MNEV SWIPT 



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

 Tongue River (Allen, 1874, p. 62). Merrill (1897, p. 355), discussing ('. rauxi. 

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

 have been unable to secure any for identification". Four seen at :\Ides 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) 



\'aix Swift 

 A rare sunuuer resident of northwestern Montann. mainly west of the con- 



