orT.,1900.] BIKDS OF THE YUKON KEGION. 91 



Lebarge July 14. The juvenile pliuiiage differs from that of D. virens 

 only in being slightly less ]>rown on crown and back. This is a new 

 species for the Yukon Valley. 



149. Seiurus noveboracensis notabilis. Grinnell Water Thrush. 



The first sound that I heard on the morning of August 1, when we 

 were on a small island about 10 miles below Sixty-Mile Creek, was the 

 unmistakable alarm note of the water thrush. This was the first time 

 we had met with this species, and before starting that morning on our 

 daily Yukon drift, Osgood and I each secured a young bird. Near 

 Forty-Mile Creek, Tatondu River, and Charlie Creek water thrushes 

 were again met with. At Circle I saw several August 16-20, took one 

 15 miles above Fort Yukon August 21, and saw two in a thicket at 

 the Aphoon mouth August 28. The young in fall plumage taken on 

 the Yukon are clove-brown above, including wings and tail — far darker 

 than is usual in notaMlis — and have darker streaks below. 



150. Wilsonia pusilla. Wilson Warbler. 



Osgood took an adult female near the Chandindu River August 4, 

 and I a 3'oung female near Charlie Village August 11 and a young 

 male 25 miles above Circle August 12. I also saw one 30 miles below 

 Circle August 20. These birds, while not typical ^>?m//^/, are, like 

 those of- the Lower Yukon, nearer it than jnleolata. 



151. Wilsonia pusilla pileolata. Pileolated Warbler. 



We found this the most al)undant bird at Glacier June 5-10, fre- 

 quenting the alder thickets from the valle^^ as far as they extended up 

 the hills. I saw a }■ ellow warbler I thought this species on White Pass 

 Summit June 12. Pileolated warblers were common at Log Cabin, 

 Bennett, and Caribou Crossing, and I am confident I heard them 

 singing at Lake Marsh. Adult males from Glacier resemble normal 

 pileolata closely, but have the back rather more green; those from the 

 Yukon Valley, while having the orange forehead and lower parts of 

 this form, have the duller green back of jyusilla. 



[Motacilla ooulark. Swinhoe Wagtail. On the morning of August 

 28 the Rohert Kerr^ on which I was a passenger, was hindered from 

 proceeding by a gale and low water on the bar, and was made fast to 

 the bank at the Aphoon mouth of the Yukon. As I came on deck I 

 saw half a dozen white wagtails fly about the vessel and settle in the 

 grass close by. While I returned for my gun they left, but a thor- 

 ough acquaintance with MotaciUa allxt in Egypt, where it is abundant 

 during the winter, leaves me no doubt that these birds were wagtails.] 



152. Anthus pensilvanicus. American Pipit. 



A male taken at Skagway June 3 was probably a belated migrant. 

 On the heights above Glacier Osgood saw several -June 5, and we 



