110 University of California Publications in Zoology. ["Vol.7 



tion, Warren, Dall, and Duke islands, Boca de Quadra, Chicka- 

 min River, Revillagigedo Island (Portage Cove), Etolin Island, 

 Bradfield Canal, Zarembo Island, Mitkof Island, Thomas Bay, 

 Port Snettisham, and the Taku River. Young birds in complete 

 Juvenal plumage were taken on Mitkof Island, early in August, 

 one secured at Port Snettisham on August 28 has nearly com- 

 pleted the post- Juvenal molt, and immatures taken on the Taku 

 River the middle of September are in the first winter plumage 

 throughout. Hermit thrushes were seen on the Taku River 

 during the whole of our stay, during September, though their 

 numbers diminished rapidly toward the end of the month. • 



Fourteen specimens of the dwarf hermit thrush were secured 

 (nos. 9339-9352). Of these, six are adults, three in juvenal 

 plumage, one undergoing the post-juvenal molt, and four imma- 

 tures in complete first winter plumage. I had hoped to find 

 guttata migrating at the Taku River, but the specimens secured 

 there, as well as all the others, appear to be strictly referable 

 to the form nana. 



Planesticus migratorius caurinus Grinnell. 

 Northwestern Robin. 

 Observed at many scattered points, but seldom in any num- 

 bers. The first was noted on Kupreanof Island, April 19, when 

 one was secured from a small flock, feeding in one of the parks. 

 During the next few days several were heard singing in the 

 tree tops about camp. A flack of eighteen or twenty was seen 

 at Three-mile Arm, Kuiu Island, on April 26, and several were 

 heard singing in the woods at Port Protection, Prince of Wales 

 Island. On Coronation Island, May 14 to 18, at Port McArthur, 

 Kuiu Island, May 18, and at Warren Island, May 19 to 23, 

 robins were quite abundant, feeding in scattered flocks along the 

 beaches, and evidently migrating. From then on until the end 

 of the summer they were but rarely seen. At Duke Island, on 

 the Chickamin River, and at Portage Cove, Revillagigedo Island, 

 scattered individuals were observed, or heard singing in the 

 woods. Juvenals were first seen at Mitkof Island, early in 

 August, but they were always singularly wild and unapproach- 

 able. A very few were noted at Thomas Bay, and, on the Taku 



