26 PACIFIC COAST AVIFAUNA No. 14 



.Many otliiT species may also lie inrhicnced by arlil'icial conditions. Reservoirs 

 built for irrigation purposes bave attracted many breeding water birds in cer- 

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

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

 eottonwoods are i)]anted for shade trees, as alont; streets in the i-csidence disti-icts 

 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 th.' 

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

 by them. 



i;iST Ol^^ Sl'KCIKS 



1. Aechmophorus occidentalis (Lawrence) 



Western Grebe 

 A migrant in the northwestern part of the state, possibly breeding in some 

 favorable localities. Records: Great Falls, three seen and one taken May 9, 

 1887 (Williams, 1888a, p. 14) ; Flathead Lake, a regular migrant in September; 

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

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

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

 Glacier National Park, A nest reported in the Park ( F. 'SI. Bailey, 1018, p. S'i). 



2. Col5rmbus holboelli ( Reinhardt) 



IldLBOELL Grebe 



Breeds at Swan Lake, Flathead County, and found in migration in other 

 localities in the western part of the state. Breeding records : Seven nests found 

 at Swan Lake between June 4 and 17, 1902, and five between June 18 and 22, 

 1903 (Sillowa.y, -190311, i)p. 298-299, 1902d, pp. 129-131). 



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

 17, 1909 (Saunders, 1911a, p. 31); seen at Lubec, Teton County, September 

 25-27, 1911 (Saunders, 1914a, p. 127) ; a dead bird found at Poison in October, 

 1912. Reported from Lake :\IacDonald and Wnterton Lake (F. M. Bailey, 1918, 

 p. 52). 



3. Colymbus auritus Linnaeus 



IIciii.xED Grebe 

 A migrant and a rai'e breeder in the northern jiart of the state. Records 

 of this sjjccies are few. It is probably counuon in migration but confused witli 

 the next species. Records : Abundant migrant on the Missouri and all streams 

 and pools in the mountains (Grinnell. lS7f), ]>. (i55). Abundant on St. ^NTary 

 Lakes and bi'ad of :\Iilk River ((irinnell, 1S88, p. :M\A). One sjiot on thi' :Madiso)i 



