564 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



wbich numerous woodland species pass. I accounted for the great 

 abundance of such birds at tbis point by the fact tbat the whole country 

 to the westward being open, and, therefore, unsuited to their wants, a 

 condensation, or a sort of tbickened, folded-over edge of the species 

 here occurred. As long as the migration lasted, the heavy timber of the 

 river-bottom was filled with the birds in a steady stream. There was 

 no occasion to go in search of specimens ; stationing myself in some eli- 

 gible spot, I bad only to take them as they came along, fluttering from 

 tree to tree, pursuing insects with a sharp, scraping note, yet never 

 long delaying their onward course. With the second week In June 

 they had all, so far as I know, passed northward ; certainly I found no 

 indication of any remaining to breed in this locality. 



The species was not observed further west in tbis latitude, though it 

 has been traced high up the Missouri by other persons. It was named 

 Sylvicola missouriensis in 1858 by Maximilian, the late Prince of Wied. 



List of specimens. 



Locality. 



Pembiua, Dak 



...do 



...do 



...do 



...do 



...do 



...do 



...do 



... do 



...do 



...do 



...do 



...do ......... 



June 2, 1873 



do .... 



Juue 3,1873 

 do 



do ... 



do .... 



.do 

 .do 

 .do 

 .do 

 .do 

 • do 



Collector. 



Elliott Covics 



... do 



... do 



....do 



...do 



...do 



...do 



... do 



do 



... do 



....do 



....do 



....do 



5.00 

 4.75 

 4.75 

 4.75 

 4.60 

 4.90 

 4.60 

 4.80 

 4.70 

 4. 1'O 

 4.75 

 4.90 

 4.90 



7.75 

 7.75 

 7.50 

 7.75 

 7.70 

 7.50 

 7.40 

 7.50 

 7.50 

 7.70 

 7.40 

 8.00 

 7.90 



Xature of specimen, 

 and remarks. 



Skin. 



...do. 

 ...do. 

 ....do. 



...do. 

 .-..do. 



...do. 

 ....do. 

 ....do. 

 ... do. 



...do. 



...do. 



...do. 



HELMINTHOPHAGA CELATA, {&ay) Bd. 



Orange crowned Warbler. 



Observed during the fall migration, in September, along the Mouse 

 River, where it was abundant. 



List of specimens. 



