26 PACIFIC COAST AVIFAUNA No. 14 



Many other species may also be influenced by artificial conditions. Keservoirs 

 built for irrigation pnr])oses have attracted many breeding water birds in cer- 

 tain areas. Grain fields attract Meadowlarks and Sharp-tailed Grouse in the 

 breeding season, and many other species in late summer and fall. Wherever 

 cottouwoods are planted for shade trees, as along streets in the residence districts 

 of cities, all of the smaller species nesting in the cottonwood grove association 

 are liable to be found. These associations will become more and more' import- 

 ant as the state is more thickly settled, until, as is the case in many parts of tli.- 

 eastern United States, the natural associations will have been largely supplanted 

 bv them. 



LIST OF SPPX'IES 



1. Aechmophorus occidentalis (Lawrence) 



Western Grebe 

 A migrant in the northwestern part of the state, po*ssibly breeding in some 

 favorable localities. Records: Great Falls, three seen and one taken May 0, 

 1887 (Williams, 1888a, j). 14) ; Flathead Lake, a reguhir migrant in September; 

 two mounted specimens in the collection of H. P. Stanford of Kalisjiell (Saun- 

 ders, 19151), p. 114) ; seen on Foy's Lake, Kalispell, October 20, 1917 (Sloanaker, 

 MS). Occurs on Lake MacDonald and the North Fork of the Flathead River, 

 Glacier xNational Park. A nest reported in the Park (F. .M. Bailey, 1918, p. 52). 



2. Colymbus holboelli (Reinhardt) 



HoLBOEi.L Grebe 



Breeds at Swan Lake, Flathead County, and found in migration in ollici- 

 localities in tiu' western part of \hv state. Breeding records: Seven nests found, 

 at Swan Lake between June 4 and 17, 1902, and five between June IS and 22, 

 1908 (Silloway, 190:^1), j)p. 298-2!)!), l!)()2d, pp. 129-181). 



Migration records: One taken at Three Forks, Gallatin County, October 

 17, 1909 (Saunders, 1911a, ]). 81); seen at Lubec, Teton (^ounty, September 

 25-27, 1911 (Saunders, 1914a, p. 127) ; a dead bii-d found at Pokon in October, 

 1912. Reported from Lake MacDonald and Waterton Lake (F. M. BaiUy, 1918, 

 p. 52). 



8. Colymbus auritus Linnaeus 



1 loK'XKI) (Jk'KKK 



A migrant aud a rare hreeder iu tlie uorllieni pai't of the state. K'eroi'ds 

 of this species ai'c few. It is probably eoniinon iu iiiigrat ion hut confused with 

 tile next species. Records: Abundant migi-ant on the Missouri and all streams 

 and pools in the mountains (Gi'innell. lS7(i, p. (155). .Xbuudant on St. ^Fary 

 Lakes and head of Milk K'iver (Griiuiejl, 1SSS. p. 8(iS). One shot ou the .Madison 



