COUES ON BIRDS OF DAKOTA A^D MONTANA. 



569 



the rauge of its Eastern conspecies within sevt'ral buiidred miles, though 

 furtlier poutb the two iray approach each other more closely. The typi- 

 cal vuic<jUlivyaui, however, has been recorded from Boxelder Creek, one 

 of the tributaries of the Missouri above the month of the Yellowstone. 



List of .<^;^;eci/He»s. 



ICTERIA VIPiENS, {Linn.) Bil 



Yellow-breas'j ED Chat. 



No Chats were observed at Pembina, nor anywhere along the parallel 

 of 49°, and it may well be doubted whether the species ever quite reaches 

 this latitude. Its absence from the Red Eiver Valley is in striking con- 

 trast to its abundance and general dispersion in the Missouri region, 

 but a comparatively short distance to the southw'ard and much further 

 west. In the Atlantic States it barely reaches into Southern Isew 

 England. 1 found it during the second season u]) the Missouri to 

 beyond the mouth of the Yellowstone. 



Litst of specimens. 



MYIODIOCTES PUSJLLUS, {^Y%h.) Bj). 



Black CAPPED Fly catchinGt Warbler, 



A species of general distribution in North America, and doubtless 

 occurring at all suitable points along the Line, though only actually 

 observed near the eastern base of the Eocky Mountains. 



List of specimens. 



