FALCONIDiE — THE FALCONS. 
137 
barred with various shades of brown. Young. Tail hoary brownish-gray,, 
crossed by numerous, very indistinct, narrow bands of darker, and faintly 
tipped with whitish. Ground-color of the head, neck, and lower parts, light 
ochraceous, or cream-color (sometimes nearly white),* the* anterior upper 
parts with large longitudinally ovate spots of black ; these- assuming the form 
of streaks on the head and neck. Sides of the breast with an aggregation 
of larger* spots 'of the same, and sides with sparser hastate or deltoid spots, 
tipper parts purplish-black, more or less variegated with ochraceous ; the 
relative proportion of the two colors varying with, the individual. 
Wing, 14.40-17.00: tail, 8.00-9.50 ; culmen, .80 - .95 ; tarsus, 2.30- 
2.70; middle toe, 1.50-^1.70. Weight 1J-3|- lbs. Hab. Western j 
Province of North America, from the Mississippi Yalley, and the region 
of the G-reat Lakes (Michigan, Wisconsin, Iowa, to Arkansas, also 
Canada and Massachusetts) to the Pacific. ( Swainson's Hawk.) 
var. swainsoni. 
Wing, 12.00-15.30; tail, 6.50-9.00; culmen, .85 -.90; tarsus, 1.95- 
2.60 ; middle toe, 1.50 - 1.60. Colors similar, but the young paler than 
that of var. swainsoni. Adult unknown. Hab. Middle and South 
Yj * America, and southern border of the western United States, from New 
Mexico to Buenos Ayres (two specimens, Costa Rica, and Buenos 
Ayres, Mus. S. I.) {Sharp-winged Hawk i) . . . var. oxypteru.s. 
B. Four outer primaries with their inner webs cut or emarginated. 
a. Form light, the legs slender ; tail of adult without a subterminal band 
of black more distinct than the others. 
3. B. zonocercus. Wing, 15.50-17.40; tail, 8.50-10.75; culmen, 
.90; tarsus, 2.50-2.80; middle toe, 1.60-1.85. Entirely deep black, 
with more or less concealed pure white spotting. Adult. Tail car- 
bonaceous-black, with three very broad zones of pure white on inner A: 
webs and ash on the outer webs. Young. Tail dark brown, the inner 
webs more or less, sometimes entirely, white, crossed by numerous 
oblique bands of black. Hab. Mexico (chiefly western?) and adjacent 
southwestern portions of the United States (Arizona, Coues ; Southern 
California, San Diego, Cooper). {Band-tailed Black Hawk.) 
4. B. lineatus. Wing, 11.25-14.25; tail, 8.00-10.00; culmen, .75- 
.90; tarsus, 2.70-3.25; middle toe, 1.30-1.50. Fourth to fifth quill 
longest ; first shorter than seventh. Outer webs of the primaries with ) 
quadrate spots of whitish; lesser wing-coverts dark rufous; lower 
parts rufous more or less barred with whitish, or whitish spotted longi- 
tudinally with dusky. Adult. Head, neck, lesser wing-coverts, and 
lower parts deep rufous, the lower parts more or less barred posteriorly '' ' ' 
with whitish. Primaries and tail black ; the former with quadrate spots 
of pure white on the outer webs, and the latter crossed by six narrow 
bands of pure white, and tipped with the same. Young. Head, neck, 
and lower parts whitish, usually more or less tinged with ochraceous, Yic 
and with longitudinal markings of dusky. Primaries and; tail dusky ; 
the former mostly ochraceous anterior to the sinuation of their outer 
webs, the latter crossed by numerous narrow bands of pale grayish- 
brown, these becoming paler and more ochraceous toward the base. 
Lesser wing-coverts more or less dark tinged with rufous. 
Adult. Lower parts 'light rufous barred with white. Young. 
White prevailing on the lower parts. Hab. Eastern Province of 
* the United States. {Red-shouldered Hawk.) . . var. lineatus. 
