1921 BIRDS OF MONTANA 167 



19031), p. 295). The nest has lu'cu found iVcciiicntly at Fhitliead Lake, where 

 this bird is tlie eoiniiionest nesting speeies. Kast ol' the divide it is less coiiiiiion, 

 and I know of no I'eeords of the finding of the ni'st in tluit jmrt of the state. 



324. ' Hylocichla guttata guttata (Pallas) 



Alaska Hermit Tiiruwii 

 A niigi'ant. One was taken at Button, May 13, 1917, hy DuBois. The speei- 

 men was sent to me and later to the Biological Survey, where the identification 

 was confirmed. Another was taken in Custer County, October 12, 1919, and 

 identified by Dr. Bishop (Hedges, MS). This form may be not uncommon as 

 a migrant, birds belonging to it doubtless having been mistaken for auduboni 

 when not collected. 



32:'). Hylocichla guttata auduboni (Baird) 



AnDiiBoN IIkkmit Tiibhsii 



A sununer resident of the mountains in the westei-n half of I lie state. Ap- 

 l)arently most abundant in southwestern Jlontana, and rare in other mountain- 

 ous regions. Not reported from northwestern Montana west of the continental 

 divide, but this may be because most observations tiiere have been made at ele- 

 vations too low for the occurrence of this bird. Breeds in the Canadian zone. 

 Not known from the eastern half of Montana even in migrations. The eastern- 

 most points where it has been found are the Belt Mountains (Williams, 189flb, 

 p. 292), and Park County, west of the Yellowstone River. TJiis species is rare 

 in Park and Gallatin counties, but (piite common in •Jefferson, Silver Bow and 

 Deer Lodge counties. It is unknown from Flathead Lake, has been found in the 

 Bitterroot Valley only once in migration, and is not known to breed in Teton 

 < 'ounty. It has been found in Glacier Park in late August (Coues, 1874b, p. 549). 



The migrations take place in May and September. Dates of spring arrival 

 are: German Gulch, May 25, 1910; Anaconda, May 17, 1911; Choteau, May 18, 

 1912; Corvallis, May 18, 1912 (Bailey, MS). Fall dates are: Gallatin County, 

 September 11, 1890 (Richmond and Knowlton, 1894, p. 308) ; Pipestone Creek, 

 Jefferson County, September 28, 1909; Gold Creek, September 10, 1910; and 

 Sun River, September 12, 1912. 



Th'e nest has been found twice in the state. One with fresh eggs was dis- 

 covered near Fort Ellis, Gallatin County, July 16, 1872 (Merriam, 1873, p. 

 674). A nest containing two eggs was found in the mountains of the Big Hole 

 Basin, June 10, 1913 (Forrest, 1914, p. 197). 



326. Planesticus migratorius propinquus Ridgway 



Wkstern Robin 

 An abundant sunuiiei' I'esident throughout the state, Repoiied liy all ob- 

 servers from all parts of Jlontana. Breeds in the Upper Sonoran, Transition 

 and Canadian zones. Found nesting in cottonwood groves and in willow thick- 

 ets, about buildings in the ]irairic i-egion and in the mountain valleys, in various 



