362 University of California Publications im, Zoology [Vol.24 



Dendroica aestiva rubiginosa (Pallas). Alaska Yellow Warbler 



Yellow warblers were extremely scarce, in' notable contrast to the 

 abundance in which I found them on the upper Stikine River, two 

 hundred miles to the northward (see Swarth, 1922, p. 287). Further- 

 more, the yellow warbler of the upper Stikine is the eastern sub- 

 species, B. aestiva aestiva, that of the upper Skeena is the coastal sub- 

 species, D. aestiva rubiginosa. The scarcity of this bird in the migra- 

 tions as well as in midsummer shows that the travels of aestiva to and 

 from its more northern breeding ground follow a northwest-southeast 

 line that lies to the eastAvard of Hazelton. 



The first yellow warbler was seen near Hazelton on June 6 ; from 

 then on a few were encountered from time to time through the summer. 

 On June 23, in Kispiox Valley, a nest was found containing five eggs. 

 On Nine-mile Mountain, the first week in August, several yellow 

 warblers were seen, presumably migrants; during the latter part of 

 the month a very few were observed migrating in Kispiox Valley, the 

 last on August 22. 



Five specimens (nos. 42475-42479) collected. Three breeding birds 

 (one male and two females) are unequivocally rubiginosa. Two adult 

 females just finishing the annual molt, taken August 19 and 22, 

 respectively, are not so certainly of that subspecies. They may be 

 migrating individuals of aestiva from farther north, but their molting 

 condition and the lack of comparable specimens in the several sub- 

 species precludes a decision. 



Dendroica coronata hooveri McGregor. Alaska Myrtle Warbler 



Myrtle warblers had already passed through on their northward 

 .journey when we reached Hazelton, May 26. In the fall they appeared 

 in numbers, abruptly ; on September 10 the first one arrived, on the 

 11th they were abundant. They were still present when I left, Sep- 

 tember 26. Two specimens collected, immatures in first winter 

 plumage (nos. 42480-42481). 



Dendroica auduboni auduboni (J. K. Townsend). Aububon Warbler 



Fairly common in the lowlands through the summer, both at 

 Hazelton and in Kispiox Valley to the northward; not seen at high 

 altitudes. Present when we arrived. May 26, and apparently then in 

 pairs. During the first week in September the Audubon warblers 



