124 BULLETIN 16 7, UNITED STATES NATIONAL MUSEUM 



(Hays, Manhattan, and Bendena) ; Iowa (Keokuk and Ilills- 

 boro) ; rarely southern Wisconsin (Sumpter, Shiocton, and Wauwa- 

 tosa) ; southern Michigan (Kalamazoo) ; rarely southern Ontario 

 (Oakville, Toronto, and Newmarket) ; New York (Geneva and Syra- 

 cuse) ; and rarely Massachusetts (Taunton). East to rarely Massa- 

 chusetts (Taunton) ; eastern New York (Orient) ; New Jersey 

 (Princeton and Moorestown) ; Maryland (Cambridge) ; Virginia 

 (Ashland) ; North Carolina (Raleigh and Fort Macon) ; South Caro- 

 lina (Oakley Depot and Charleston) ; Georgia (Savannah and St. 

 Marys); and Costa Rica (El Mojon). South to Costa Rica (El 

 Mojon) ; Guatemala (Duenas) ; Oaxaca (Totontepec) ; Sinaloa 

 (Mazatlan) ; and California (Salton Sea, Volcano Mountains, Pasa- 

 dena, and Santa Barbara.) West to California (Santa Barbara, 

 Paicines, Berkeley, Marin County, and Glen Ellen) ; and Oregon 

 (Klamath Lake and Salem). 



Migration. — Although the Cooper's hawk is found with fair regu- 

 larity in winter throughout almost all of its breeding range, there is 

 nevertheless a well-defined migration. In this respect its movements 

 agree with those of its smaller relative the sharp-shinned hawk, with 

 which it frequently travels. For the same reasons the usual method 

 of showing the migration by early and late dates is not entirely satis- 

 factory. Accordingly, the following brief comment, with a few dates 

 in the West, will be sufficient to illustrate the spring and fall flights. 



Spring migration. — The northward movement in spring takes place 

 usually during the latter part of March and early part of April. 

 Some observers have indicated that at this season the Cooper's hawks 

 seen on Long Island, N. Y., may outnumber all other hawks put 

 together. The earliest date of arrival of migrating birds at Ithaca, 

 N. Y., is March 17, while the average date is March 25. Point Pelee, 

 Ontario, a favorite area for the observation of hawk migrations, does 

 not show a heavy spring flight, the small number seen usually passing 

 through in early May. Apparently the heaviest known flight of 

 these hawks at this season takes place at AVhitefish Point, on the south 

 shore of Lake Superior. The birds are most abundant during the 

 first few days of May, only a few being seen after May 12. 



Cooper's hawks have been observed to arrive in the western part of 

 their range, as folloAvs: Minnesota — Wilder, March 3; Hutchinson, 

 March 12; and Fridley, March 18. Manitoba— Margaret, March 24; 

 and Treesbank, April 4. Montana — Fortine, March 29; Billings. 

 March 30; and Columbia Falls, April 10. British Columbia — 

 Okanagan Landing, February 9 ; Comox, March 25 ; and Edgewood, 

 April 21. 



Fall migration. — The southward movement in autumn is frequently 

 more conspicuous. Late dates of departure in the western part of the 

 range are : British Columbia — Okanagan Landing, November 4, 



