KRIDBU'S HAWK. 213 



The parent bird soared above the nest while the young bird was being taken, 

 and her noticeably white appearance attracted our attention at once, and we 

 judged her to be oi' this species. The growth of the young bird has gradually 

 contirmed this idea, as it now, at the age of nearly three months, shoAvs unmis- 

 takable evidences of being this light variety of Red-tailed Hawk. * * * 

 This bird has become very tame and is a great pet, allowing itself to be 

 handled, and distinguishes persons."^ 



Mr. Robert Ridgway, of the Smithsonian Institution, has also examined 

 two females of this race which were shot from their nests in Minnesota, and 

 as far as I have been able to learn this State is the only one in which 

 Krider's Hawk is as yet positively known to breed. It is likely, however, 

 that it also nests in the prairie regions of Wisconsin, Iowa, and northeastern 

 Illinois. Mr. H. C. Cole, of Chicago, Illinois, writes me that he collected a 

 bird of this race at Half Day, Lake County, Illinois, 34 miles northwest of 

 Chicago, on July 25, 1876, which evidently was a summer resident. Its 

 mate was also seen, but was too wa,ry to be shot. This specimen is now 

 in the U. S. National Museum collection. 



It has been repeatedly reported as breeding in western Texas and like- 

 wise among the cliffs of Colorado, but these records are somewhat questionable 

 and require confirmation. No specimens actually taken during the breeding 

 season in these States have as yet found their way into any of oiir larger 

 ornithological collections. 



There are no positively identified specimens of the eggs of Krider's 

 Hawk in the U. S. National Museum collection, but they are not likely to 

 differ materially from those of the preceding species. Nidification seems to 

 take place a little later than with the common Red-tailed Hawk. The win- 

 ters are spent in more southern latitudes, in Texas and. southward. 



73. Buteo borealis calurus (Cassin). 



WESTERN EED-TAIL. 



Buteo calurus Cassin, Proceediugs Academy Natural Sciences, Phila., vii, 1855, ^81. 

 Butbo borealis var. calurus Ridgway, Bulletin Essex Institute, v, November, 1873, 186. 

 (B 20, 24, C 351a, R 436&, C 517, U 3376.) 



Geographical range : Western North America, from the Rocky Mountains to 

 the Pacific; south into Mexico; casual east to Illinois. 



The breeding range of the Western Red-tail, a darker colored race thaii 

 the two preceding, extends from northern and northwestern Texas, through 

 the Rocky Mountain regions of Colorado, New Mexico, and Arizona, north- 

 ward through Wyoming, central and western Montana, Utah, Nevada, and 

 Idaho, and on the Pacific coast from Lower California, through California, 

 Oregon, and Washington well into British Columbia. A single specimen, a 



' Bulletin Nuttall Ornithological Clab, Vol. 5, January, 1880, p. 17. 



