COUES ON BIRDS OF DAKOTA AND MONTANA, 



549 



There remains the agreeable duty of witnessing the ready and unvary- 

 ing courtesy extended to the Naturalist of the Commission by Mr. Camp- 

 bell and Major Twining, who sought to aid by all means in their power 

 the scientific interests he had in charge ; and by Captain W. F. Gregory, 

 Corps of Engineers, U. S. A., to whose party he was attached during 

 the season of 1874. 



TUEDUS (PLANESTICUS) MIGRATORIUS, Linn. 



The Egbin. 



Found in abundance at Pembina, where it was breeding in the wooded 

 river-bottom. In this latitude, the eggs are generally laid during the 

 middle and latter parts of June, and I scarcely think that more than one 

 brood is reared annually. Further westward the species seems to occur 

 chiefly during the migrations, as most of the country is unsuited to its 

 wants. In September, large numbers were observed in the fringes of 

 trees along the Mouse Eiver. During the second season, the birds were 

 again found on the Upper Missouri Eiver and in the Eocky Mountains. 

 On the whole, the species is much less numerous, excepting in the 

 immediate valley of the Eed Eiver, than it is in settled and wooded 

 portions of the United States, and probably none pass the winter in 

 this latitude. 



List of specimens. 



TUEDUS (HYLOCICHLA) PALLASI, Cah. 



Hermit Thrush. 



The Hermit Thrush was not observed during the Survey until toward 

 the close of the second season, when specimens were taken in the Eocky 

 Mountains near Chief Mountain Lake, under circumstances which left 

 no doubt of its breeding in the vicinity. As it is, however, a common 

 species of wide distribution in North America, it is doubtless to be 

 found, like the Eobin, wherever timber grows, along the line of the 

 JNorthern Boundary. 



