FALCONIDiE — THE FALCONS. 
135 
Above with conspicuous darker shaft-streaks; top of the head deep 
black; markings on tile lower parts in the form of irregularly defined, 
narrow, zigzag bars, or fine lines, of a bluish-slaty tint ; throat not 
barred. Tail with only about four indistinct bands of blackish. Wing, 
12.00-14.70; tail, 9.50-12.75; culmen, .80-1.00; tarsus, 2. 70-3,20; 
middle toe, 1.70-2.00. Eggs bluish-white. Hab. Northern portion 
of North America. (. American Goshazuk.) . . . var. atrieapillus , j 
Genus ASTTXRXNA, Vi billot. (Page 125 .) 
A. nitida. Wing, 9.80- 11.50; tail, G.70 - 8.00 ; culmen, .80 - 1.00 ; tarsus, 
2.50-2.90; middle toe, 1.40 - 1.75. Adult. Above clear ash, paler on the 
head and darker on the rump ; the general surface with more or less appreci- 
able transverse bars, or indications of bars, of a paler shade, and with darker 
shafts. Upper tail-coverts immaculate white. Tail deep black, fading into 
pale grayish-brown at the end, narrowly tipped with white, and crossed by 
two to three white bands. Lower parts, including the tibiae, axillars, and 
throat, regularly barred with deep ash and white, the two colors about 
equal in extent ; chin and crissum immaculate white. Young. Above 
blackish-brown, variegated with pinkish-ochraceous. Tail umber, tipped 
with pinkish-brown or dull whitish, and crossed by six to seven narrow 
bands of black. Beneath white, sometimes tinged with ochraceous; the 
breast, abdomen, and sides with longitudinal tear-shaped spots of black. 
Adult. Upper surface distinctly barred, the lighter bars predomi- 
nating ; the top of the head as distinctly barred as the lower parts. 
Young. Tibiae immaculate white or pale ochraceous. Culmen, .80 -.90. 
Hab. South America, from S. E. Brazil and W. Ecuador, to Panama. 
var. nitida 
Adult. Upper surface only obsoleteiy barred, or almost uniform ; the 
top of the head without any bars. Young. Tibiae transversely barred 
with dusky. Culmen, .75 - .80. Hab. Middle America, north to the 
southern border of the United States; straying northward in the Mis- 
sissippi Valley, to Southern Illinois. (Mexican Hawk.') . var. plagiata. 
Genus ANTENOR, Bidgway. (Page 125.) 
A. unicinctus. Wing, 11.65 - 14.60 ; tail, 9.00 - 11.00 ; culmen, .82 - 1.10 ; 
tarsus, 2.78- 3.75 ; middle toe, 1.52 - 2.00. Adult. General color brownish- * 
black or blackish-brown, uniform, or slightly variegated by light spotting ; 
the lesser wing-coverts and tibiae deep rufous, or chestnut. Tail black; the 
end and base white, as are also the tail-coverts. Young. Plumage greatly 
variegated. Above blackish-brown, the feathers edged with rusty; head 
and neck streaked with pale ochraceous. Lower parts pale ochraceous or 
yellowish-white, the breast and abdomen with longitudinal ovoid spots of 
blackish ; tibiae with transverse bars of dark rusty ; lower tail-coverts with 
black shaft-streaks. Lesser wing-covert region only washed with rufous. 
Tail grayish-brown, whitish at the tip, and crossed by narrow bands of 
dusky. 
Adult with the blackish much broken up by lighter spotting. Wing, 
11.65 - 14.60 ; tail, 9.00-10.50 ; culmen, .82 - 1.02 ; tarsus, 2.78-3.40; 
middle toe, 1.52 - 1.85. Hab. South America . . var. unicinctus* 
