194 THE CHICAGO ACADEMY OF SCIENCES. 



In its migrations, this Thrush passes through the United 

 States, east of the Great Plains, northward to the Arctic coast, 

 Alask: -.~.d eastern Siberia ; in winter it passes southward through 

 Cer- America to Colombia. It breeds north of the United 

 Stai. 



Hylocichla ustulata swainsoni (Cabanis). Olive-backed Thrush. 



Turdus swainsoni Cabanis, Fauna Per., 1845-1846, 187. 



Turdua ustulatus B swainsoni Ridgway, Field and Forest, II, May, 



1877, 195. 

 Hylocichla ustulata swainsoni Ridgway, Proc. U. S. Nat. Mus., Ill, 



August 27, 1880, 166. 

 Popular synonym : Swainson's Thkush. 



The Olive-backed Thrush is an abundant migrant, arriving, 

 in the spring, from the last of April to the last of May, and re- 

 turning, in the fall, from the first of September to the middle 

 of October. Mr. E. W. Nelson thought it possible that this 

 species might be a rare summer resident. He says:* "I ob- 

 tained a specimen near Chicago, June y, 1873, ^^^ J^^X 9> the 

 same year, Mr. Rice obtained a second specimen." 



The range of the Olive-backed Thursh covers America from 

 Brazil and Peru through North America, east of the Great Basin, 

 to Labrador and Alaska ; it is also found as a straggler on the 

 Pacific coast. It breeds in the mountainous portions of the north- 

 eastern United States, northward from Pennsylvania, in the 

 southern Sierra Nevadas and northward through the Rocky 

 Mountains and in British America. 



Hylocichla guttata pallasii (Cabanis). Hermit Thrush. 



Turdus pallasii Cabanis, Archiv. f. Naturg., 1847, I, 205. 



Turdus aonalaschkw pallasi Ridgway, Proc. U. S. Nat. Mus. Ill, 



March 27, 1880, 1. 

 Hylocichla unalaskw pallasii Ridgway, Proc. U. S. Nat. Mus., Ill, 



August 27, 1880, 166. 

 Hylocichla guttata pallasii Faxon and Allen, Birds Berkshire Co., 



Massachusetts, 1900, 9. 

 Popular synonyms : Rufus-tailed Thrush. Swamp Robin. Solitaby 



Thrush. Eastern Hebmit Thrush. 



The Hermit Thrush is an abundant migrant, arriving, in the 

 spring, from the first of April to the twentieth of May, and re- 

 turning, in the fall, from the middle of September to the last 

 of October. 



The range of this species covers eastern North America from 

 the Gulf of Mexico northward. It breeds from northern Michi- 



*Birds ot Northeastern Illinois, Bull, of the Essex Institute, Vol. VIII, 1876^ 93. 



