140 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



distinct, white, instead of ochraceous-buff and the dark fuscous-black bands 

 more continuous, less broken than on the breast feathers; sides, flanks, 

 and thighs as in the male — ^but more ochraceous; under tail coverts as 

 in the male but with more white bars (not only the terminal one as in 

 the males); iris Vandyke brown; "comb" vermiHon; bill blackish; feet 

 pale brownish gray, claws blackish. 



Adult female, rufous phase. — Similar to the gray phase but with the 

 ochraceous-buff extending over the whole underparts from the chm to as 

 far as the middle of the abdomen, and brighter, slightly more ochraceous- 

 tawny as well ; a,bove the ochraceous color more pronounced on the head, 

 nape, interscapulars, lower back, rump, and upper tail coverts; the pale 

 markings on the wings more buffy — pale grayish clay color; rectrices 

 often with narrow buffy tips or subterminal blotches. 



Immature male. — Like the adult but with the juvenal outer primaries 

 (narrowly marked with buff on the outer webs instead of whitish as in 

 adults) and with the rectrices more often tipped very narrowly with 

 whitish. 



Immature female. — Like the adult of the corresponding phase but with 

 the juvenal outer primaries; not readily distinguishable in many cases. 



luvenal (sexes alike). — Above similar to the adult female, rufous 

 phase, but with the scapulars and inner secondaries with white terminal 

 shaft streaks and these feathers abundantly marked with concentric longi- 

 tudinal as well as transverse ochraceous-buff irregular bands; the inter- 

 scapulars and upper wing coverts with small medioterminal white marks ; 

 the chin and upper throat largely devoid of buffy-white speckled with 

 blackish; and the lower abdomen, flanks, and thighs dirty smoke gray 

 indistinctly bari-ed with dusky; iris Vandyke brown; "comb" pale ver- 

 milion; lower mandible yellowish beneath at base, brownish elsewhere. 



Downy young (sexes alike). — Forehead, sides of head, and entire 

 underparts mustard yellow to Naples yellow; a black line from the bill 

 through the eye to the sides and back of the nape; another black spot 

 on the middle of the forehead, and another fuscous-black line bordering 

 the crown and occiput, which are amber brown to Sanford's brown; 

 wings, back, lower back, and rump like the crown and occiput, from 

 which they are separated in color by an intrusion of the yellow of the 

 sides of the head across the interscapulars; an irregular blackish line 

 f rona the flanks around the lower back to the tail. 



Adult male.— Wing 172-192 (182.3); tail 118-144 (129.3); exposed 

 culmen 14-20.7 (16.9); tarsus 31.8-37.2 (34.9); middle toe without 

 claw 32.3-40.2 (35.4 mm.), ^o 



°° Forty-six specimens from Alberta, British Columbia, Saskatchewan, Washington, 

 Idaho, and Montana. 



