600 Colorado College Publication 



Hylocichla fuscescens salicicola. Willow Thrush. 



Migrant; not common. Arrives May IS. We have no 

 autumn records. 



This is the least common of our thrushes with the ex- 

 ception of the Alaska Hermit Thrush. Henshaw, Allen and 

 Keyser report it from the lower mountains, 8,000-8,500 feet. 



Hylocichla ustulata swainsoni. Olive-backed Thrush. 



Migrant; common. Arrives May 9-15, and is abundant 

 the rest of the month. 



At Calhan and Ramah, June 4-7, 1898, Aiken found this 

 species very numerous, estimating that over 100 individuals 

 were seen. 



Hylocichla guttata guttata. Alaska Hermit Thrush. 



Migrant; not common. Usually arrives the first week in 

 May, earliest date April 20, 1907, at Red Rock Canon. 



Migrates through the lower foothills and on the plains ; 

 found by Aiken along Fountain Creek from the town of Foun- 

 tain north, in the vicinity of Colorado City, and also taken at 

 Limon, Lincoln County. This is a bird of somewhat different 

 habits from our other thrushes, keeping more on the ground, 

 and in its flights not rising so high in the air; also much less 

 shy and more approachable. 



Hylocichla guttata auduboni. Audubon's Hermit Thrush. 



Summer resident in the mountains ; common. Arrives 

 early in May, earliest date April 13, 1882, Allen and Brews- 

 ter. A common migrant along the foothills and on the plains. 



This species breeds in the mountains from 8,500 feet up, 

 for Shaw found it in Crystal Park at that altitude in summer 

 and notes that their songs were very common in the evening. 

 Keyser found a nest with 4 eggs near Lake Moraine, in the 

 lower limbs of a spruce. Aiken's notes contain a reference 



