1911] Swarth: Alaska Expedition of 1909. 99 



seen on any of the islands. At Boea de Quadra, June 9 to 14, 

 one was heard singing on several occasions. On the Chickamin 

 River, June 17 to 28, probably eight or ten were seen or heard 

 singing, in clumps of willow on the meadows, but they appeared 

 to be migrating, and specimens secured at this time were 

 evidently not breeding. At Thomas Bay, August 13 to 23 they 

 were migrating southward, a few individuals being seen in mixed 

 flocks composed of Townsend and pileolated warblers, kinglets 

 and chickadees. On the Taku River they were seen from time 

 to time up to the last day of our stay, September 28. All that 

 were observed were exceedingly wild and unapproachable, and 

 it was with the greatest difficulty that any were obtained. Eight 

 specimens were secured, three adult males and two adult females 

 from the Chickamin River (nos. 9508-9512), two immatures, male 

 and female, from Thomas Bay (nos. 9513, 9514), and an imma- 

 ture female from the Taku River (no. 9515). 



Dendroica coronata hooveri MeGrregor. 



Alaska Myrtle Warbler. 



Met with only on the Taku River, where, however, the species 



was not at all uncommon. First noted on September 7, and seen 



dailv thereafter up to the end of my stay, evidently migrating, 



and usually in loose flocks of from six to ten individuals. 



Nine specimens were collected, all immatures in first winter 

 plumage. At this stage hooveri is apparently but very slightly 

 distinguished from true coronata. Compared with a small series 

 of autumnal immatures from Illinois the Alaskan birds average 

 slightly larger, while the coloration of the upper parts is some- 

 what darker. The specimens secured measure as follows : 



Bill from 

 No. Sex Date Wing Tail Tarsus Nostril 



9524 c? Sept. 7 74.0 58.0 17.5 7.0 



9525 c? Sept. 7 73.0 54.0 18.0 7.0 

 9257 d' Sept. 10 76.0 58.0 18.0 7.0 

 9828 c? Sept. 10 77.5 60.8 16.5 7.2 



9529 c? Sept. 12 74.0 56.0 17.5 7.2 



9531 c? Sept. 14 73.0 58.2 17.5 



9526 ? Sept. 9 69.0 54.0 17.0 7.2 



9530 ? Sept. 13 69.0 55.0 17.2 7.0 



9532 ? Sept. 24 70.5 52.8 16.0 



