242 UNIVERSITY OF COLORADO STUDIES 



759a. Hylocichla guttata auduboni — Rocky Mountain Hermit Thrush. 



Common summer resident in the mountains. Gale's numerous nests were taken at 

 from 5, 800 to 10,000 feet in June and July. 

 7610. Planesticus migratorius propinquus — Western Robin. 



Abundant summer resident from plains to timberline. Some usually remain through 

 the winter and in the winter of 1904-5 they were abundant in Boulder, feeding upon 

 frozen apples and woodbine berries. Gale believed that many of them have their first 

 brood on the plains, then go into the mountains for the second. They usually become 

 much less common in Boulder in July and August. 

 7650. Saxicola oenanthe leucorhoa — Greenland Wheatear. 



Ridgway considers Minot's solitary record of wheatear probably of this subspecies, 

 but admits the possibility that it is 5. cenantht. 

 766. Sialia sialis — Bluebird. 



Gale took this species several times in the mountains and took its eggs on June 6, 1889. 

 767a. Sialia mexicana bairdi — Chestnut-backed Bluebird. 



Summer resident of lower mountains, not usually common. On October 1, 1908, I 

 found it abundant on the South St. Vrain, southwest of Lyons. 

 768. Sialia currucoides — Mountain Bluebird. 



Common summer resident of plains and abundant in the mountains, nesting from 

 plains to timberline. 



