744 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



region and forehead conspicuously white; the scapulars, interscapulars, 

 and upper wing coverts very sparsely, if at all, marked with black; 

 underparts immaculate white, stained or tinged with very pale 

 pinldsh cinnamon, chiefly on the breast; under wing coverts pure 

 white; tail pattern uniform (variable in the nominate race), the 

 outer web of the outermost pair of rectrices white, the inner web and 

 both webs of all the others hazel, tipped with white and crossed by a 

 broad subterminal blackish band; cere and angle of mouth bright 

 orange-red; iris dark brown; bill pale bluish becoming slate-black at 

 tip; tarsi and toes deep orange chrome; claws black. 



Adult male. — Rufous phase. — Forehead, crown, occiput, nape, 

 scapulars, interscapulars, back, rump, upper wing and tail coverts 

 dark slate, the feathers of the head and upper wing coverts Avith fine 

 black shafts, the larger scapulars and interscapulars with obscure 

 median blackish spots; a black nuchal collar connecting on either end 

 with the solid blackish auriculars, cheeks, superciliaries, and lores; 

 primaries as in light phase, but the white of the inner webs replaced 

 by dirty smoke gray; secondaries as in light phase, but dark- — dark 

 slate with blackish shaft streaks and no transverse bars; upper tail 

 coverts washed with Brussels brown; rectrices argus brown to Brussels 

 brown instead of hazel, otherwise as in light phase; chin and middle of 

 throat dull ashy white; rest of underparts deep rufescent Brussels 

 brown to bright hazel, slightly paler on the under tail coverts; under 

 surface of tail pale dull hazel; under wing coverts slate spotted with 

 blackish. 



Adult female. — Light phase: Similar to that of Falco sjMrverius 

 sjparverius, but the upperparts brighter, more rufescent, hazel, the 

 blackish cross bars much less numerous and narrower; crown with no 

 or only a fairly small hazel patch; rectrices with 10-11 black bars, some 

 of the more distal ones (but not the broader, subterminal one) scarcely 

 touching the shaft; outermost pair of tail feathers wdth outer web 

 edged broadly Avith ochraceous-white or white, pale rufescent next to 

 the shaft; entire underparts white, a faint buffy wash on the breast 

 and sides and lower abdomen, the sides and the breast with a few 

 small (very small on the breast) elliptical spots of tawny; under wing 

 coverts immaculate white; soft parts as in the adult male. 



Adult female. — Rufous phase: Similar to that of the light phase, 

 but with the entire forehead, crown, and occiput solid dark slate with 

 no rufescent patch; the dark bars on the upperparts much more 

 numerous and much broader, the general color brighter and more 

 ferruginous than in the light phase; the inner webs of the primaries 

 more deeply washed with hazel; chin and middle of throat dirty 

 white; rest of underparts, including the sides of the neck and the 

 under wing coverts deep rusty cinnamomeous paling very considerably 



