. Una lista distributiva degli uccelli del Montana, con note sulla migrazione e nidificazione delle specie più conosciute. La metà occidentale dello stato. Verv abbondanti sul lato ovest della divisione continentale, wheie 166 COSTA DEL PACIFICO AVIFAUNA No. 14 è la specie più eoiiionest ioimd sulle rive del lago Flathead. Razze in zone di TinTransition e Canadian, in foreste di conifere o in foreste di eonilVrsand alberi a foglia larga misti. Si verifica in migrazione nella parte orientale dello stato, dove è regolare ma non comune. I record più orientali del suo allevamento;irc dalle P>elt Mountains (
1787 x 1397 px | 30,3 x 23,7 cm | 11,9 x 9,3 inches | 150dpi
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. A distributional list of the birds of Montana, with notes on the migration and nesting of the better known species . t the western halfof the state. Verv abundant on tiie west side of the continental divide, wheie 166 PACIFIC COAST AVIFAUNA No. 14 it is the eoiiDiionest species ioimd on the shores of Flathead Lake. Breeds in tinTransition and Canadian zones, in coniferous forests or in forests of eonilVrsand broad-leaf trees mixed. Occurs in migration in the eastern part of the state, where it is regular but not common. The easternmost records of its breeding;irc from the P>elt Mountains (Williams, ISDOh, p. 292), the mountains of FergusCounty (Sillovvay, 1903a, p. 69), and the Hig Horn Mountains (McChcsney, 1S79. p. 2:^84). The migrations take place in May and September. Dates of spring migra-tion in portions of the state where it does not breed are as follows: Custer Coun-ty, May 31, 1906 (Cameron, 1908a, p. 55) ; Miles City and vicinity, May 11 toJune 7, 1902, thirteen specimens (Hedges, coll. Univ. Montana). In regionswhere this species breeds it nrrivi-s nbout the middle of May. Three years at. Fig. 34. Nest and eggs of the Olive-b.cked Thrush. Yellow Bay, Flathead Lake; June 29, 1914. Great Falls, give an average of May 15, and tlie earliest Jlay 3, 1892; three yearsat Columliia Falls average May 19, the earliest JMay 17, 1896 (Cooke, 1907, p.122). In the Belt Mountains it is said to arrive May 10 (Williams, 1890b, p.292). Other dates are : Bozeman, June 1, 1909 ; Norton Gulch, Silver Bow Couu-t.v, May 16, 1910; Anaconda, May 14, 1911 ; Choteau, May 22, 1912; Teton River, lIay 28, 1915; and Button. May 27-June 4, 1916 (DuBois, MS). Fall migrationtakes place from September 1 to October 10 (Williams, 1890b, p. 294). The lat-est date at Columbia Falls is September 23, 1895 (Cooke, 1907, p. 124). Theonly other definite fall date I know of is from Sun River, September 4, 1912. Nesting begins about the middle of June, and eggs may be found from thenuntil the midd
