92 NOETH AMERICAN FAUNA. [no. 19. 



found them conimoii at Summit Juno 11-13. A female taken June 13 

 was laying, and a fresh but empty nest I found the same day I attrib- 

 uted to this species, no other being near. This nest was loosely 

 formed of line dry grass in a hollow in the deep moss which covered 

 the almost perpendicular side of a bowlder lying on a hill high above 

 Summit, only a small hole for entrance showing in the moss. We 

 often saw the song-flight at Summit. Launching himself with a sharp 

 preliminary ' chip ' from one of the granite bowlders that abound 

 there, the male would rise rapidly to a height of a hundred feet or 

 more, uttering a sweet, clear song. After poising high in air and 

 repeating this song for several minutes the singer would slowl}^ float 

 toward earth and alight 100 yards from where he started, soon to repeat 

 the same performance. We found a pair on the heights above Ben- 

 nett June 17, and a few, possibly members of one family, at Circle 

 August 15-20. 



153. Cinelus mexicanus. American Dipper. 



We collected a female and set of four fresh eggs at the falls at 

 Glacier June 8. A single ouzel seen farther down the river June 10 

 was probably the mate of the ore taken. Osgood also took one at 

 Unalaska October 5. 



151. Anorthura hiemalis pacifica. Western Winter Wren. 



We noticed a few at Glacier June 4-10, and I took a male there 

 June 6. 



155. Anorthura alascensis. Alaska Wren. , 



I saw one at St. George October 3, and we collected five at Unalaska 

 October 5. The young were then molting. 



156. Sitta canadensis. Red-breasted Nuthatch. 



I took a male at Skagway May 31 and another near Log Cabin 

 flune 20, and heard one on an island at the junction of the Lewes and 

 Pelly rivers July 26. This species has not heretofore been noted in 

 the Yukon Valley. 



157. Parus atricapillus septentrionalis. Long-tailed Chickadee. 



AVe took this species at Bennett June 19, west shore of Lake Ben- 

 nett flune 24, Caribou Crossing June 26, Lake Marsh July 7, and Lake 

 Lebarge July 15, but did not notice it again until we reached the Lower 

 Yukon, although chickadees were heard several times whose specific 

 identity was not determined. Thirty miles below Holy Cross Mission 

 I took two August 25, and at the Aphoon mouth I saw a small flock 

 August 28. Young able to fly were taken July 7. One taken August 

 25 had completed the molt into first winter plumage, while an adult 

 taken the same da}" was in fresh plumage. 



