The Birds of El Paso County, Colorado S87 



not penetrate into the mountains. A shy and elusive bird, 

 though its song is continually heard in the early summer 

 months. Olive Thorne Miller mentions finding a nest with 

 three eggs near Camp Harding, on Cheyenne Creek ; and Aiken 

 mentions in notes young hatched June 25, 1872. 



Wilsonia pusilla pileolata. Pileolated Warbler. 



Summer resident in the mountains ; common. Arrives 

 about May 14. Leaves in September, latest date October 13, 

 1912. 



This species is the western representative of the Wilson's 

 Warbler. It is rather common during the spring migration 

 in the thickets along the streams, found out on the plains 

 as well as near the mountains, remaining until the last of May, 

 but retires to the mountains to breed, and sometimes breeds 

 in the Alpine willows above timberline. Minot found a nest 

 at Seven Lakes which he describes as follows : "Here, June 

 22, [1880] I found a nest five fresh eggs. The nest was sunken 

 in the ground, on the eastern slope or border of the swamp, 

 at the end of a partly natural archway of long"dry grass, open- 

 ing to the southward, beneath the low, spreading branch of a 

 willow. It is composed of loose shreds, with a nest lining of 

 fine stalks and a few hairs, and with a hollow two inches 

 wide and scarcely half as deep." 



Setophaga ruticilla. Redstart. 



Rare; not many records. Dates of arrival are May 17, 

 1905; May 14, 1898; May 18, 1882; May 21, 1872. 



Allen saw it at Colorado City in 1871 ; he was there early 

 in August. Almost all the birds which Aiken has taken or seen 

 here have been immature males, in the plumage of the second 

 year, and but one full plumaged male has been taken. There 

 are no breeding records for the County. 



