1922] Swarth: Birds and Mammals of the StiUne Region 



305 



On Sergief Island, hermit thrushes were fairly numerous up to 

 the first week in September. One was taken on August 23, still in 

 the Juvenal plumage (no. 40316), and one on August 27, which had 

 finished the molt into the first winter plumage (no. 40317). 



rig. GG Fig. HH 



Fig. GG. The olive-baeked thrush {Eylocichla ustulata swainsoni) is a bird 

 of the dry woods of poplar, alder, and willow, as contrasted with the hermit 

 thrush, a denizen of coniferous woods. The nest of olive-backed thrush here 

 shown was in a thicket of alder and willow mixed, and in all respects is typical 

 of the species as it occurs in this region. At the time this nest was photo- 

 graphed (on June 19, and near Telegraph Creek) it contained four eggs. 



Fig. HH. Alaska hermit thrush {Hylociohla gwttata guttata) standing over 

 nest. The nest was built upon the interlaced branches of two small spruce 

 trees, about three feet from the ground, and at the bottom of a cool, shady 

 canon. Photograph taken near Telegraph Creek, June 4, 1919. 



Planesticus migratorius migratorius (Linnaeus) . Eastern Robin 

 At the time of our arrival at Telegraph Creek, robins were present 

 in full force. They were abundant along the river and scarce at higher 

 altitudes, but some were seen clear to the Summit. On May 30 one 

 bird was seen carrying building material, but this must have been 

 rather late, for young were out of the nest on June 9. Robins were 

 fairly numerous at Glenora and at Doch-da-on Creek. By the time we 

 reached the latter place, the middle of July, the spotted young com- 

 prised a large proportion of the birds seen. 



