240 UNIVERSITY OF COLORADO STUDIES 



680. Oporornis tolmiei — Macgillivray Warbler. 



Recorded by Minot. Found nesting in lower mountains by Gale, who says it nests 

 up to 11,000 feet, but gives no data to sustain the statement. I have taken it at 10,500 

 feet in early September. 



681. Geothlypis trichas occidentalis — Western Yellow-throat. 

 Common summer resident at western edge of plains. 



683a. Icteria virens longicauda — Long-tailed Chat. 



Common summer resident at western edge of plains. 

 685a. Wilsonia pusilla pileolata — Pileolated Warbler. 



Common on plains in migration, common summer resident from 10,000 to 11,000 

 feet. W. pusilla may be found here, but all specimens I have had in hand were identified 

 as pileolata. 

 687. Setophaga ruticilla — American Redstart. 



Common in migration at Boulder, much less common as a summer resident. 

 697. Anthus rubescens — American Pipit. 



Common on plains in migration, abundant summer resident above timberline. Cooke 

 says lowest known nest is from 11,000 feet on Bald Mountain . 



701. Cinclus mexicanus unicolor — American Dipper. 



Common resident along mountain streams, nesting up to 11,000 feet. Sprague 

 found it nesting down to 7,000 feet in Boulder Canyon. In winter a pair or two are 

 found within the city limits of Boulder at 5,300 feet. 



702. Oroscoptes montanus — Sage Thrasher. 



Occurs sparingly on plains and in mountains. One in University cabinets. I have 

 seen a few and it has been reported by Gale, Dille and Young. 



703. Mimus polyglottos leucopterus — Western Mockingbird. 



Not common in this county. Have seen but two or three at Boulder. Gale found it 

 nesting at Left Hand, etc., in 1886 and 1887. 



704. Dumetella carolinensis — Catbird. 



Common summer resident of plains and lower mountains. 



705. Toxostoma rufum — Brown Thrasher. 



Not common summer resident of plains. I have seen but one. Gale found it nesting 

 several times. 

 715. Salpinctes obsoletus — Rock Wren. 



Common summer resident of foothills and mountains, locally abundant. Common 

 also at Valmont Butte on the plains. 

 7170. Catherpes mexicanus conspersus — Canyon Wren. 



Recorded from Boulder by Anthony, November 23, 1892, from Longmont October 

 20, 1907, by Burnett, and I saw one at Boulder March 23, 1907. Dille found it nesting 

 in foothills in late March and early April, 1907. 

 721a. Troglodytes aedon parkmanii — Western House Wren. 



Common summer resident of plains and mountains, more commonly nesting in moun- 

 tains up to 10,000 feet. Gale found it at Gold Hill on May 5, 1890. His six nests were 

 taken at from 8,000 to 10,000 feet. 



