BUTEO. 229 



ovoid spots of blackish; tibiae with transverse bars of dark rusty; lower tail- 

 coverts with black shaft-streaks; lesser wing-covert region merely washed with 

 rufous ; tail grayish brown, whitish at tip, and crossed by numerous (about 19) 

 narrow bands of dusky. 



a 1 . Adult never with the darker portions of the plumage uniform, but more or less 

 broken, especially on lower parts, with whitish and buffy spotting and streak- 

 ing ; tibiae barred with ochraceous ; wing 11.65-14.60, tail 9.00-10.50, culmen 

 .82-1.02, tarsus 2.78-3.40, middle toe 1.52-2.00. Sab. South America, as far 

 as Chili and the Argentine Republic. 



P. unicinctus (Tbmm.). One-banded Hawk. 1 



a?. Adult with the darker portions of the plumage perfectly uniform ; prevailing 

 color uniform dark sooty brown; lesser wing-coverts, under wing-coverts 

 and thighs plain rich chestnut-rufous ; middle wing-coverts dusky medially 

 rufous on edges ; tail black, the base and a broad band at tip, white ; tail- 

 coverts white, the upper sometimes with blackish shaft-streaks. Immature : 

 Similar to adult, but the blackish above broken by ochraceous edgings the 

 head and neck thickly streaked with the same; lower parts ochraceous, striped 

 or longitudinally spotted with dusky ; thighs narrowly barred with rusty and 

 dark brown ; tail as in adult, but white band at tip narrower and less sharply 

 denned, and inner webs of feathers more or less distinctly barred with dusky, 

 grayish brown, and white. 2 Downy young : Above pale chestnut-buffy, paler 

 (almost dull whitish) across hind-neck; lower parts entirely dull whitish, 

 tinged, more or less, with dull brownish buff. Male : Length 17.50-21.00, 

 wing 12.35-13.75, tail 9.80-10.20, culmen .90-.95, tarsus 3.15-3.20, middle toe 

 1.65-1.70. Female: Length 21.00-24.00, wing 14.25-14.50, tail 10.80-11.00, 

 culmen 1.08-1.10, tarsus 3.40-3.75, middle toe 1.90-2.00. West on bushes or 

 low trees. Eggs 2-3, 2.11 X 1.61, white, glaucous-white or buffy white, usu- 

 ally more or less marked with light brownish. Sab. Middle America, north 

 to southern border of United States (Louisiana to Lower California). 



335. P. unicinctus harrisi (Aud.). Harris's Hawk. 



Genus BUTEO Cuvier. (Page 223, pi. LXYIII., figs. 2-5; pi. LXXII., fig. 8.) 



Species. 



a 1 . Tail more than half as long as wing; tarsus much less than half as long as tail; 

 primaries exceeding secondaries by much less than length of tail. 

 b l . Wing more than 13.50. 



c 1 . Outer webs of quills without white, buffy, or ochraceous spots. 



d 1 . Four outermost quills with inner webs distinctly emarginated. 



1 Falco unicinctus Temm., PI. Col. i. 1824, pi. 313. Parabuteo unicinctus RiDGW. in B. B. & R. Hist. N. 

 Am. B. Hi. 1874, 249. ' 



2 In this stage much resembling the adult of P. unicinctus. 



