1911] Swarth: Alaska Expedition of 1909. 109 



B. calendula cineraceus in corresponding plumage from the 

 mountains of southern California, being of a sooty olive-green 

 cast, as compared with the decidedly grayish color of the latter. 

 The immatures in the newly acquired winter plumage are of a 

 noticeably deep tone of coloration. The immature males all 

 have the red crown patch, though it appears to be the last of 

 the plumage acquired; in the single immature female there is 

 no trace of it. 



Hylocichla ustulata ustulata (Nuttall). 

 Eusset-backed Thrush. 



Seen at very few points and in limited numbers. The first 

 were observed on the Chickamin River, June 24, when several 

 were seen or heard in the woods. I am under the impression 

 that they had just arrived, for we had been at this point for a 

 week without seeing any, while from then on they were heard 

 ahnost every day. At Portage Cove, Revillagigedo Island, 

 several were heard singing in the woods, at Bradfield Canal 

 several were seen at various times, while on the Taku River two 

 were observed on September 4, the last time that the species 

 came under my observation. They were at all times exceedingly 

 shy and difficult to approach, moving from place to place in the 

 tree tops, and though frequently heard singing, it was but rarely 

 that a bird was seen. 



One specimen was secured, an adult male, shot on the 

 Chickamin River on June 25 (no. 9363). 



Hylocichla guttata nana (Audubon). Dwarf Hermit Thrush. 



Quite generally distributed, and fairly common throughout 

 the whole of the region, but during the spring and summer at 

 least, very difficult to get sight of. They could be heard singing 

 on all sides, especially about dusk, but it was only occasionally 

 that I could catch a fleeting glimpse of a bird flitting through 

 the shrubbery, or feeding on the ground under the thick bushes. 

 The first arrival was noted at Kuiu Island, on May 4, and from 

 then on they were seen or heard at practically every point 

 visited. Points of record are as follows : Prince of Wales Island 

 (Port Protection, Calder Bay, and Klawak Salt Lake), Corona- 



