292 BULLETIN 16 7, UNITED STATES NATIONAL MUSEUM 



is fairly common in California in winter. While driving over the 

 interior valleys during March, we occasionally saw one of these 

 hawks standing on the ground on some grassy plain or cultivated 

 field, probably hunting ground squirrels. The white breast shows 

 up very conspicuously in such situations, but it may help to obliterate 

 the outline of the hawk, as seen against the sky by its humble prey. 



DISTRIBUTION 



Range. — Southwestern Canada, Western United States, and north- 

 ern Mexico. 



Breeding r^ange. — The ferruginous roughleg breeds north to Wash- 

 ington (Chelan) ; soutliern Alberta (Pigeon Lake, Red Deer River, 

 Little Sandhill Creek, and Medicine Hat) ; Saskatchewan (Crane 

 Lake, Quill Lake, Estlin, and Touch Avood Hills) ; southern Manitoba 

 (Margaret and Treesbank) ; and northeastern North Dakota (prob- 

 ably Grafton). East to eastern North Dakota (probably Grafton, 

 Stump Lake, and Lake Washington) ; western South Dakota (prob- 

 ably Rapid City); northwestern Nebraska (probably Harrison); 

 northeastern Colorado (Avalo, Sterling, and River Bend) ; probably 

 western Kansas (Hays and Pratt) ; probably the panhandle of Texas 

 (Potter and Armstrong Counties) ; and southwestern New Mexico 

 (Fair View). South to southern New Mexico (Fair View) ; Arizona 

 (20 miles southeast of Flagstaff) ; and central California (Cosumne 

 River). West to California (Cosumne River and Jess Valley) ; 

 Oregon (Boardman) ; and Washington (Chelan). 



Winter range. — The ferruginous roughleg may sometimes winter 

 throughout its entire breeding range. For example, a specimen was 

 taken at Spokane, Wash., on January 22, 1926, while it has been 

 observed at Edmonton, Alberta, and at Eastend, Saskatchewan, 

 during this season. 



Generally, however, the winter range extends north to Oregon 

 (Fort Dallas) ; casually eastern Montana (Custer, Dawson, and 

 Fergus Counties) ; and southern South Dakota (the Black Hills, 

 Forestburg, and Vermillion). East to southeastern South Dakota 

 (Vermillion) ; eastern Colorado (Boulder and Wray) ; western 

 Kansas (Ellis) ; New Mexico (Engle and San Andreas Mountains) ; 

 Texas (Somerset, Port Lavaca, and Corpus Christi) ; and Hidalgo 

 (Real del Monte). South to Hidalgo (Real del Monte) ; and south- 

 ern Lower California (Sierra de la Laguna). West to Lower Cali- 

 fornia (Sierra de la Laguna, Santo Domingo, and Ensenada) ; 

 California (Brawley, Corona, Paicines, Santa Cruz Mountains, 

 casually Cotati, Marysville, and Red Bluif ) ; and Oregon (Fort 

 Dallas). 



Spring migratio7i. — Early dates of spring arrival, at points north 

 of the regular winter range, are: North Dakota — Antler, March 24; 



