118 
Eagles retire in spring to British America to breed, but Mr. Ridgway 
says that a few still breed in Northern Illinois, and they probably do 
so in northern Minnesota, as I have seen them there about the first of 
June. 
In the spring of 1885 a Golden Eagle was reported from Paris, I., 
March 6; from Laporte City, Iowa, March 14; and from Williamstown, 
Iowa, March 30. Even as late as April 19 one was shot at Mount 
Carmel, Mo. 
350. Thrasaétus harpyia(Linn.). [450.] Harpy Eagle. 
A tropical American species, rarely straggling as far north as our 
southern border. Said to have been taken once in Texas, at the delta 
of the Rio Grande (Oswald, Am. Nat., 1878, p. 151). 
352. Halizétus leucocephalus (Linn.). [451.] Bald Eagle. 
Locally distributed throughout the whole of North America. It has 
no regular migration, but after breeding throughout the Mississippi 
Valley it disappears from some places for the winter, while it remains 
at others. Generally speaking, it leaves the North when the freezing 
of the waters prevents it from getting its accustomed food, but some- 
times it remains through the winter even as far north as latitude 47° in 
Minnesota, where, in the heavy pine forests, I have found it throughout 
the year, and where it nests quite commonly. In the spring of 1884 
it moved back to summer quarters in northern Iowa about March 20. 
In western Texas it is an abundant resident (Lloyd). In the fall of 
1885, at Saint Louis, Mo., the first Bald Eagle was seen September 9. 
November 7 four were seen, and the next day two more. 
354. Falco rusticolus Linn. [412a.] Gray Gyrfalcon; Iceland Gyrfalcon. 
An accidental winter visitant from the north. A specimen was cap- 
tured at Manhattan, Kans., December 1, 1880. 
854a. Falco rusticolus gyrfalco (Linn.). [412b.] Gyrfalcon: McFarlane’s Gyr- 
falcon. 
Like the last, an accidental visitor in winter. Taken by Dr. Agers- 
borg, at Vermillion, Dak., October 21, 1880. 
354b. Falco rusticolus obsoletus (Gmel.). [412¢c.] Black Gyrfalcon; Labrador 
Gyrfalcon. 
Has been taken in Minnesota a few times as a rare winter visitant; 
a specimen has been examined by Mr. Ridgway. 
355. Falco mexicanus Schleg. [413.] Prairie Falcon. 
This hawk is found principally in the West, but occurs east to the 
eastern border of the plains in Texas, Indian Territory, Missouri, Kan- 
sas, Nebraska, and Dakota. It winters from Kansas southward, and 
passes north in the summer to central Dakota, where it was noted as 
being very common in August. Dr. Agersborg gave it as a rare mi- 
