THE BIRDS OF FLOYD COUNTY, IOWA. 205 
and I have observed brooding birds as early as May 2 (1917). 
‘These birds breed in considerable numbers in the woods along 
the Cedar River between Charles City and Floyd, and also 
north of Floyd. 
Since field determinations of the various Red-tailed Hawks 
are at best rather questionable it is quite probable that some 
of the records noted above apply to the following form. 
82. Buteo borealis krideri (Hoopes.) Krider’s Hawk. This 
paler phase of the Red-tail is probably not uncommon in the 
‘region but due to lack of distinction between it and the pre- 
ceding species records are scarce. On September 3, 1917, I 
found a dead bird belonging to this variety. Dr. Bailey - 
_ (Raptorial Bds. of Iowa, 1918, 109) records the species as 
occurring in Cerro Gordo County and nesting in Hancock. 
83. Buteo lineatus lineatus (Gmel.) Red-shouldered Hawk. 
Apparently my statement ( Wilson Bull. 96; 137) to the effect 
that this species was more common in Floyd County than the 
Red-tail was unjustified. I should by no means class the 
species as rare, as does Anderson (Bds. of Ia., 1907; 249), but 
its numbers are certainly less than those of the preceding. It 
nests throughout the county. I have seen nests near Charles 
City, Floyd, Nora Springs and Rockford in every year since 
1914. 5 
84. Buteo swainsoni (Bonap.) Swainson’s Hawk. An un- 
common species. Webster states that he has seen the species 
two or three times in the last five years. I saw one specimen 
in woods west of Charles City on April 30, 1918. Mrs. F. 
May Tuttle, of Osage, has a specimen taken in Mitchell County 
on May 13, 1914. I know of no nesting records. 
85. Buteo platypterus (Vieill.) Broad-winged Hawk. A 
common species throughout the county. I have found it 
nesting in the neighborhood of Charles City in 1913, 1915, and 
1918. September 24, 1917, a flock of 16 of these birds was 
seen in Brackett’s woods, north of Charles City. In May, 
1918, a pair was found nesting southeast of Nora Springs. In 
June of the same year a nest was found in the oak grove 
above the Hackberry Grove clay bank, in Cerro Gordo County. 
86. Archibuteo lagopus sancti-johannis (Gmel.) Rough- 
