512. 
513. 
542 SYSTEMATIC SYNOPSIS. —RAPTORES — ACCIPITRES. 
coopert), or of very partial distribution in N. Am. In all cases, the sexes are alike or similar; 
the 9 is larger than the ¢; the young are different from the adults; melanism is frequently 
exhibited. 
Analysis of Subgenera and Species. 
Five outer primaries emarginate or sinuate on inner webs ; tail more than 3 the wing ; bill high at base ; * 
nostrils oval, with eccentric tubercle. (Parabuteo.) 
Tail blackish (with white base and tip); lesser wing-coverts and tibiz reddish ; general plumage 
blackish. Southwestern U. S., common Cae ee ae ae er Seas - unicinctus 512. 
Four outer primaries emarginate or ‘Sinai on inner webs, 
Tail white, with a broad black subterminal zone and numerous very narrow, zig-zag, or broken, 
blackish cross-lines. Texas . ae albocaudatus 513 
Tail mostly white, ashy-clouded ; marked eng thsalae with rious and darker ; and with dark sub- 
terminal zone ; under parts mostly white. Cala., one specimen known a - . .cooperi 514 
Tail mottled with dusky and white, and with subterminal blackish zone; showing also reddish 
touches. Plumage almost entirely blackish, with fleecy-white bases of feathers. Kas. to Tex., 
little known 2 4 A oS » 2. se herlani 515 
Tail of adult cheaiie-r20, “with read black eubternninal bar, and others or not ; no reddish on wing- 
coverts; white prevailing on under parts, especially breast. Tail of young closely barred with 
grayish and blackish. Largest and most robust ; a usually 14.00 or more; tarsus stout. 
N. Ain., abundant . i . ae borealis 516-519 
Tail of adult black, crossed by about 6 white bars ; prim: aries spotted with white ; lesser wing-coverts 
reddish, like under parts. Tail of young dusky, numerously barred with whitish; under parts 
whitish, streaked with dusky. Less robust; wing usually under 14.00; tarsus slender. N. Am., 
abundant . . ae oak . lineatus 520, 521 
Tail of adult black, with 3 er white a zones on inner webs éniy of the feathers, ashy on outer webs ; _ 
plumage black, spotted or not with white. Tail of young dusky, inner webs mostly white, 
black-barred. Southwestern U.S. . . ee eee ~ . . abbreviatus 522 
Three outer primaries emarginate or sinuate on inner webs. 
Tail numerously and narrowly cross-barred with lighter and darker. Plumage extremely variable, 
but not extensively reddish underneath, nor cheeks with a dark mustache. visi wing usually 
over 18.00. Chiefly western U. S., abundant swainsoni 523 
Tail of adult blackish with about 3 light gray bands epoca: under parts "extensively rufous ; 
a dark moustache. SmalJl; wing under 12.00. Eastern U. S., common « pennsylvanicus 524 
Tail (of adult ?) crossed with numerous light and dark bars (6-8 of each); general color fuliginous, 
scarcely or not varied. Southwestern U.S. . re 5 ey. 18 rae a brachyurus 882, 883 
* Heavy-weights; 5 outer primaries cut. 
B. unicin’ctus har’risi. (Lat. wni-, once; cinctus, girdled. To Edw. Harris.) Harris’s 
Buzzarp. Adult # 9: General plumage blackish, more or less intense, sometimes rather 
dark chocolate-browu, blackening on wings and tail, but in any case pretty uniform over the 
whole body. Lesser and part of middle wing-coverts, lining of wings, and the tibize, brownish- 
red, or rich chestnut. Tail-coverts and base of tail broadly white, thus girdling the whole 
figure ; end of tail also white for an inch or more. Length of ¢ about 20.00; extent 41.00- 
46.00 ; wing 12.50-13.50; tail 8.50-9.50; tarsus 3.00-3.25 ; middle toe without claw 2.00. 
@ larger; about 23.00; extent 43.00-47.00; wing 13.50-14.50; tail 9.50-10.50. Young: 
Less decidedly blackish, the upper parts varied with rusty-brown, lower quite tawny with 
dusky spots or streaks, chestnut of wings not unbroken, and white of tail less distinctly defined. 
Tibia tawny-white, distinctly barred with chestnut. But in any plumage the species is un- 
mistakable, forming a separate subgenus from Buteo proper, by some ranked as a genus; 
the loral region is extensively denuded to the eye, and furnished with short radiating bristles. 
In some respects it resembles Polyborus, being a sluggish, carrion-feeding bird, usually found 
associated with the caracara, turkey-buzzard, and black vulture. It is a common inhabitant of 
the warmer parts of America and over our Mexican border; abundant in some parts of Texas. 
Nest in a tree or bush; eggs commonly 2, measuring 2.00-2.10 x 1.70, white or whitish, 
unmarked or with faint brownish-yellow. (Parabuteo Ridg. Erythrocnema Sharpe.) 
** Heavy-weights ; 4 outer primaries cut. 
B. albocauda’tus. (Lat. albus, white; caudatus, tailed.) WHITE-TAILED Buzzarp. Adult 
& 9%: Tail and its coverts white, with a broad black subterminal zone, with numerous 
