\ 



156 PACIFIC COAST AVIFAUNA No. 14 



The occurrt'iicr ;i1 (iiTat Fjills. cited above, is the only record which may 

 indicate the date of arrival. The Brown Thrasher nests in June (Caniei'on, 

 1908a, p. 52) ; a nest was found l)etween Forts Union and Benton, June 22, 18G() 

 (Cooper, 18fi9b, p. 296). 



;}03. Salpinctes obsoletus obsoletus (Say) 



Rock Wren 



A common suuuiici- resident throughout tiie stat(\ P>ree(ls in the I'pper 

 Sonoran and Transition zones, in badlands and about the sides of prairie buttes 

 in the prairie region, and in rocky situations aliout the foothills of the mountains 

 in the western half of the state. Prefers arid rocks in regions that are more o)' 

 less treeless. Occurs rarely in the Boreal zone in migration. Rcporttnl l)y lU'arly 

 all observers. 



The migrations take {)laee in ]\Iay and September. The species arrives about 

 May 15 in Custer and Dawson counties (Cameron, 1908a, p 58). Otlier dates 

 are: Divide Creek, Silver Bow Count.y, one seen April 13, 1910. not common ti'l 

 May 1 (Saunders, 1914a, p 31) ; Traill Creek, Park County, May 14, 1909; Ana- 

 conda, May 20, 1911; Rattlesnake Butte, Teton County, May 27, 1912. Fall 

 dates are : Deer Lodge County, September 8, 1909, two birds observed in rocks 

 above timberline at 9000 feet; Willow Creek, Powell County, September 18, 1910. 



There are several records of the finding of the nest of tlie Rock Wren in 

 Montana, but none with definite date of nesting. A nest was found with eight 

 eggs at Fort Benton about June 25, 1860 (Cooper, 1869b, p. 297). Young 

 are full-feathered l\y July 3 (Cameron, 1908a, p. 53). I have observed young 

 oat of the nest on Fish Creek, Silver Bow County, July 10. 1910, and on Wild 

 Horse Island, Flathead Lake, July 2, 1914. 



304. Thryothorus ludoviciaims ludovicianus (Latham) 



C.\R()LiNA Wren 

 Hare in the southeastern part of the state. Two obtaineil in Ma.y on tiie 

 (livi(h' between Powder and Tongue rivers, and one in May and two in August 

 at Lame Deer (Thorne, 1894, p. 218). Seen neai- Billings in 191S (Thomas, MS). 



305. Troglodytes aedon parkmani Audubon 



Western IlorsE Wren 



A common sunnner i-esident cvei- most of the state P)ree(is in the Transition 

 zone, in holes in trees, in groves of c()ttonw(»()(l or yellow piiu'^. or in bird boxes 

 and crevices of buildings about ranches and in towns. Rare in the southwestern 

 part of the state, whei-e it is not rei)or1(Ml fi-om Jefferson, Silver liow. Deei' 

 Ijodge or Powell counlics, nor from the IVig lioh' Basin, it is rai'e, though 

 breeding, occasionally, near Stevensville. in tiie iJil terroot \'all<y i Uaile.v. IMS). 

 In all othci' parts of llie state ol)ser\ei's report it as coimiion. 



Spi'ing migrations take place in .May. but no data on fall migration are to 

 be had. Exact dates are as follows: Sedan, (iailatin Couiiiy. May 20, 1909; Cho- 



