MUSEUM OF COMPARATIVE ZOOLOGY. 161 



among the dwarfed willows and birches just above the general limit of 

 tnes. Three species (Anthus ludovicianus, Leucosticte tephrocotis, and 

 Lagopus leucurus) were met with exclusively above the timber line. 



From about 11,500 feet altitude up to the tree limit the fauna appears 

 to be strictly representative of the Hudsonian fauna of the Eastern 

 Province, while that above the tree limit more resembles that of the 

 American arctic fauna. 



TURDID^J. 



1. Turdus migratorius. Abundant. Frequently met with far above 

 timber line. Found a nest containing newly batched young within three 

 hundred feet of the upper limit of trees. 



2. Turdus Pallasi. Common ; ranging upward to the timber line. 

 Its song was heard at all hours of the day at our camp, near Montgomery. 



3. Myiadestes Townsendii. Several were observed at an altitude 

 of over 12,000 feet, or near the timber line. 



CINCLID^. 



4. Cinclus mexicanus. Common on the Platte above Montgomery. 



SAXICOLID.S3. 



5. Sialia arctica. Abundant. More numerous here than we found it 

 at any other point. It was seen by Mr. Bennett on the top of Mount 

 Lincoln, and it breeds up to the limit of trees. Saw a brood of newly 

 Hedged young at the extreme upper edge of the timber. 



SYLVIID.E. 



6. Regulus calendulus. Common as high as the timber line. Shot a 

 female feeding her newly Hedged young. 



PARID.33. 



7. Parus montanus. Common. Collected full-grown young, July 23d. 



SITTID.ffi. 



8. Sitta carolinensis, var. aculeata. A single individual. 



TROGLODYTIDjE. 



9. Salpinctes obsoletus. Observed several pairs among the rocks 

 near the timber line. 



MOTACILLID^. 



10. Anthus ludovicianus. Common among the snow-fields above 

 timber line. Saw young birds scarcely able to fly, July 20th. 



VOL. III. 11 



