BIRDS OF NORTH AND MIDDLE AMERICA 417 



Young. — Dusky brown above, the feathers more or less margined 

 and otherwise variegated with tawny or rusty; head, neck, and under- 

 parts mostly tawny or ochraceous, variegated with dusky brown 

 marking mostly of longitudinal tendency, tail grayish brown, mottled 

 or irregularly marked with darker. 



Range.- — Western and northern South America and northward to 

 Guatemala and to southern Sonora. (One species with two races.) 



KEY TO THE RACES OF URUBITORNIS SOLITARIA 



a. Larger, wing of (^ over 530 mm., of 9 550 mm.; under tail coverts distinctly 

 barred and mottled with graj'ish white (southeastern Sonora) . 



U. s. shefl3eri (p. 420) 



aa. Smaller, wing of cf under 500 mm.; under tail coverts nearly uniform blackish 



(Oaxaca and Guatemala south to Venezuela, Colombia, Ecuador, and Peru). 



U. s. solitaria (p. 417) 



URUBITORNIS SOLITARIA SOLITARIA (Tschudi) 



Southern Solitary Eagle 



Adult male. — Nearly uniform slate color, inclining to slate-gray on 

 some of the wing feathers, especially outer webs of secondaries, which 

 are indistmctly banded with darker, the head and neck somewhat 

 darker, inclining to blackish slate; primaries blackish slate or slate- 

 black distally, plain slate-gray anterior to their sinuation, the corre- 

 sponding portion of their iiuier webs banded with slate-gray and slate 

 color or blackish slate, as are also the inner webs of secondaries, the 

 latter with a broad terminal area of blackish slate; longer upper tail 

 coverts narrowly tipped with white, clouded with gray, and with a few 

 concealed bars or transverse mottlings of gray and white on basal 

 portion: tail black, narrowly tipped with white shaded with gray, 

 crossed near middle by an uninterrupted band (about 40-45 mm. wide) 

 of white mottled or shaded Avith graj^, ard with traces of a narrow 

 band of same anterior to this, the latter more distinct on inner webs of 

 rectrices; no white on under surface of wing, which are wholly deep slate- 

 gray anteriorly shading into black or slate-black distally, the slate-gray 

 on inner webs of primaries more or less mottled, on broader portion, 

 with darker; bill blackish, the basal half of mandible and extreme 

 lower posterior angle of maxilla pale yellowish gray (in dried skin) ; 

 cere, loral region, and superciliary shield light yellowish gray (yellow 

 in life?); iris dark brown; '** legs and feet light yellowish gray (yellow 

 in life). 1° 



Adult female. — Similar to adult male, but with a very slight fuscous 

 cast on crown, nape, upper wing coverts, and, to a very small extent, 

 on the underparts generally, the white tail band broader. 



1° According to Tschudi {cit. infra). 



