THE BIRDS OF BOULDER COUNTY 



241 



726b. Certhia familiaris montana — Rocky Mountain Creeper. 



I have seen but one with certainty, at Boulder, in winter. Sprague collected it at 

 Magnolia. Noted at Boulder by Rockwell, January 16, 1904. 

 727c. Sitta carolinensis nelsonii — Rocky Mountain Nuthatch. 



Resident in mountains. Reported by Sprague and Gale as 5. c. aculeata, and by 

 Blanchard as S. carolinensis. Gale found it nesting at 9,500 feet. Noted by Rockwell 

 at Boulder, January 16, 1904. 



728. Sitta canadensis — Red-breasted Nuthatch. 



Resident. Reported by Sprague and Gale. 

 730. Sitta pygmaea— Pygmy Nuthatch. 



Common resident in mountains. Seventeen sets of eggs in Gale collection were 

 taken at from 8,200 to 10,000 feet and all but two in June. 

 735a. Penthestes atricapillus septentrionalis— Long-tailed Chickadee. 



Common summer resident of mountains, winter resident of plains. 

 738. Penthestes gambelii— Mountain Chickadee. 



Abundant resident of mountains, winter resident of plains. Eighteen nests in Gale 

 collection were taken at from 8,200 to 10,000 feet and all but three in June. The eggs 

 vary in color. 



748. Regulus satrapa— Golden-crowned Kinglet. 



Felger has one taken by Gale in Four-mile Gulch, August 21, 1888. 



749. Regulus calendula— Ruby-crowned Kinglet. 



Taken by Sprague at Magnolia, and by Gale several times between May 31 and Sep- 

 tember 10. Two nests are in the Gale collection, of 6 and 8 eggs respectively, the latter 

 June 6, 1893, the other undated. 



751. Polioptila caerulea— Blue-gray Gnatcatcher. 



I saw one at Boulder on May 12, 1905, under very favorable circumstances for obser- 

 vation and feel sure of identity. 



754. Myadestes townsendii — Townsend Solitaire. 



Common resident in mountains, winter visitor on plains. Gale's nests are from 

 8,500 to 9,000 feet and mostly from abandoned mine shafts. 

 756a. Hylocichla fuscescens salicicola — Willow Thrush. 



Gale took nest on June 13, 1884, but gives no locality except Boulder County. 

 758a. Hylocichla ustulata swainsonii— Olive-backed Thrush. 



Rare summer resident of mountains, migrant on plains. Gale noted it on the St. 

 Vrain as early as April 16 in 1890 and in the mountains as late as October 19 in 1889. 

 There are two nests in his collection, one from 9,500 feet, the other without locality label. 

 [758c. Hylocichla ustulata almce — Alma Thrush. 



Reported by Dille in 1904, but the subspecies is not now considered valid (Auk 

 XXV, 355).] 



759. Hylocichla guttata— Dwarf Thrush. 



Sprague's Magnolia record stands alone. As the identification was at the time con- 

 firmed by Ridgway it seems best to retain the record in the absence of definite information, 

 though perhaps a re-examination might now result in its rejection. 



