KRTDER'S HAWK 165 



lowing month at Blue Island, 111. ; while another banded in May at 

 Denzer, Wis. (no. 235860) was shot in November at Kusk, Tex. One 

 banded in May at Chester, Mass. (no. 312005) was killed the follow- 

 ing November at Brandy wine Summit, Pa. ; and one banded at Mid- 

 dlefield, Mass. (no. 386652), in June was recovered in November at 

 Springfield, Va. 



Casual records. — The red-tailed hawk was listed by Macoun (1909) 

 as breeding in Newfoundland, but no supporting evidence was cited ; 

 Noble (1919) states that it is found in Labrador but not in New- 

 foundland, while Austin (1932) does not list it among the birds of 

 Newfoundland Labrador. 



A specimen of B. h. horcalh is said to have been shot in Notting- 

 hamshire, England, in the autumn of 1860. 



Egg dates. — Alaska and Canada : 53 records, April 3 to June 12 ; 

 26 records. May 4 to 18. 



New England and New York : 148 records, March 25 to June 21 ; 

 74 records, April 4 to May 17. 



Maryland to West Virginia : 15 records, March 26 to April 26 ; 7 

 records, March 27 to April 8. 



Ohio to North Dakota : 85 records, March 6 to June 30; 42 records, 

 April 7 to May 3. 



Iowa to Colorado : 44 records, February 28 to June 28 ; 22 records, 

 April 3 to 28. 



Washington to California: 292 records, February 14 to May 29; 

 146 records, March 19 to April 1. 



Arizona and Texas to Florida: 97 records, February 18 to June 

 17 ; 48 records, March 7 to April 3. 



BUTEO BOREALIS KRIDERI Hoopea 

 KRIDER'S HAWK 



HABITS 



Krider's hawk is a well-marked pale race of the red-tailed hawk, 

 occupying the plains and prairie regions of the Middle West. It 

 was described and named by Bernard A, Hoopes (1873) from a pair 

 of immature birds taken by John Krider in Winnebago County, Iowa, 

 in September 1872. An excellent colored plate, published with the 

 description, illustrates the extreme white phase in immature plumage. 

 Tlie adult is much like the eastern red-tailed hawk, but lighter 

 colored; there is much white on the upper parts, the tail is pale 

 rufous, and the under parts are nearly pure white, with very few 

 markings and with only a pale buffy tinge in the thighs. Krider's 

 hawk is easily recognizable in all plumages by extreme lightness, 

 although the immature plumages of the light phase of Harlan's hawk 

 are nearly as light colored and closely resemble it. 



