PASSERES SYLVIIDAE KEGULIJS CALENDULA. 



165 



ing them from among the small branches and interstices of bark, and now 

 darting forth in chase of them as they fly past. 



The species breeds in the heavy pine and spruce forests on the mount- 

 ains of Colorado, and also in Arizona, both in the White Mountains and as 

 far south as Mount Graham, in both which localities I saw the old birds 

 leading about their young, still in the nesting plumage as late as August 1. 

 In the mountains near Fort Garland, Col., it was a common species in June ; 

 the pine woods at an elevation of 10,000 feet often echoing with the music 

 of its sweet, beautifully modulated song, which is also wonderful for its 

 power and the purity of its tones. 



That .its nesting habits should so long remain unknown is by no 

 means surprising, since, were it not for the song, its presence in these forests 

 would hardly be detected, frequenting, as is its habit at this season, the tops 

 of the tall coniferous trees. June 11, while collecting on a mountain near 

 the Rio Grande, I discovered a nearly finished nest, built on a low branch 

 of a pine, which I have little doubt belonged to this bird. The male was 

 singing directly overhead ; but, although I watched for some time in hopes 

 of being able to see the female in the act of building, I was disappointed. 

 The nest was a somewhat bulky structure, very large for the size of the 

 bird, externally composed of strips of bark, and lined thickly with feathers 

 of the Grouse (Canace obscura). 



