BVTEO. 229 



ovoid spots of blackish; tibife 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. 



rt'. 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- 

 inij ; tibite barred with ochraceous; wing 11.65-14.60, tail 9.00-10.50, culmcn 

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

 as Chili and the Argentine Eepublic. 



P. unicinctus (Temm.). One-banded Hawk.' 



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 rust}- and 

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

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

 graj-ish brown, and white.' Downy young : A hove pale chestnut-buff}-, 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. Nest on bushes or 

 low trees. Eggs 2-4, 2.13 X 1-65, white, glaucous-white or buffy white, usu- 

 allj' more or less marked with light brownish. Hab. Middle America, north 

 to southern border of U^nited States (Tjouisiana to Lower California). 



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



GENrs BUTEO Ccyier. (Page 223, pi. LXVIIL, figs. 2-5; pi. LXXIL, fig. 8.) 



(Species. 



a". 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. 

 6'. Four outer primaries with inner webs distinctly emarginated. 



c'. Outer webs of primaries without white, buffy, or ochraceous spots. 



> FaUo unictncliK Temx., PI. Col. i. 1824, pi. 313. Paraluteo unicinctu* KlDGW. in B. B. A R. Hist. X. 

 km. B. iii. 1874, 249. 



' In this stage much resembling the ndittt of P. unicincliit. 



