74 University of California Publications in Zoology. [Vol. 7 



mon, quite generally distributed, and we met with it at nearly 

 all points visited. Specimens were seen at Coronation and 

 Warren islands, and at San Alberto Bay and Klawak Salt Lake, 

 Prince of Wales Island, at Rocky Bay, Dall Island, Boca de 

 Quadra, the Chickamin River, and Portage Cove, Revillagigedo 

 Island. But a single bird was seen on Zarembo Island, and at 

 Thomas Bay, about the middle of August, the species was 

 evidently becoming scarce. The last hummingbird was observed 

 at Port Snettisham, on August 31, a single bird seen several 

 times at the edge of a willow thicket. 



Nuttallornis borealis (Swainson). Olive-sided Flycatcher. 



Three specimens secured at Thomas Bay, where several others 

 were seen. The first was observed on August 17, and they were 

 subsequently noted daily, evidently migrating. Their habit of 

 perching on the tops of the tallest available trees made them 

 difficult birds to shoot, and it was only by using heavy loads that 

 any specimens were obtained. At Port Snettisham two were seen 

 on August 29, but neither was secured. While the species may 

 breed along the coast of southern Alaska, I do not think it prob- 

 able that it does, but believe rather that the individuals seen 

 were migrants from some interior region, as were several other 

 species of birds that appeared about the same time. 



The three specimens secured are not perceptibly different 

 from others taken in southerji California and Arizona. The two 

 adult males (nos. 9707, 9708), taken on August 17 and 20, 

 respectively, are in worn summer plumage, and just beginning 

 the post-nuptial molt, as evidenced by a few new, partly 

 ensheathed feathers on the top of the head and on the dorsum. 

 The third, an immature male in first winter plumage (no. 9709), 

 August 21, compared with others in corresponding plumage from 

 southern California, is actually somewhat paler colored through- 

 out, and with the whitish areas more extensive than in most of 

 the latter. This is a species that is wonderfully resistant to 

 the effects of varying local conditions, specimens from southern 

 California to Alaska, and from the Atlantic to the Pacific, pre- 

 senting exactly the same appearance. 



