566 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



DENDRCEOA AUDUBONI, (Toivns.) Bd. 



Audubon's Warblee. 



Audubon's Warbler was ouly observed in the Eocky Mountains, beyond 

 the eastern foothills of which it is not known to extend. From the 

 Eocky Mountains to the Pacific, it is as abundant, in suitable localities, 

 as the Yellow-rump is in most parts of the East, and its counterpart in 

 habits. The individuals found about Chief Mountain Lake did not 

 appear to be migrating, — in fact, the full movement had not begun at the 

 period of observation, — and the species doubtless breeds in this locality 

 in the heavy pine timber. 



Libt of sj)ecme7is. 



DENDECECA STEIATA, {Fornt.) Bd. 



Black-poll Waebler. 



A specimen of this species, procured on Woody Mountain, was ob- 

 ser%'ed in the collection made by Mr. G. M. Dawson, geologist of the 

 English Commission. 



DENDEOECA PENNSYLVANICA, [Liym.) Bd. 



Chestnut-sided Warblee. 



One specimen only of this distinctively Eastern specimen was secured 

 at Pembina, — perhaps its western, if not also nearly its northern, limit. 

 It was not observed beyond the Eed Eiver. This is one of the more 

 delicate species of the genus, which regularly breeds little, if any, beyond 

 the Northern States, and entirely withdraws in winter, reaching Central 

 and even South America. I have not found any indication of its occur- 

 rence west of the longitude of the Eed Eiver in any latitude. 



