684 



BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



whitish bars; rest of abdomen, thighs, posterior portion of flanks, 

 and the under tail coverts rich ochraceous-buff to dark cinnamon- 

 bufT, immaculate; under wing coverts very pale cinnamon, those 

 forming a broad border to the bend of the wing immaculate, the 

 others barred and serrated with chaetura black, the greater under 

 coverts white instead of cinnamon-buff; bare orbital area light yellow; 

 iris deep yellowish brown to dark hazel; cere light yellow; bill yellowish 

 basally, slate color terminally; tarsi and toes light yellow; claws black. 



Adult. — Cinnamon phase: Similar to the white phase, but with the 

 forehead narrowly pinkish buff; the supraoral stripe, the cheeks, 

 auriculars, and nuchal collar pinkish cinnamon; the chin, throat, and 

 breast ochraceous buff to cinnamon buff. 



Juvenal (sexes alike). — White phase: Generally similar to the adult 



Figure 49. — Falco (Rhynchofalco) femoralis. 



of the white phase, but the top of head and interscapulars darker, 

 almost chaetura black, mixed with buffy brown; rest of upper surface 

 of body and of wings somewhat darker than in adults and heavily 

 washed with hair brown to buffy brown; rectrices fuscous instead of 

 blackish and with 10 instead of 8 whitish bars; the breast with large, 

 elongated wedge-shaped streaks of fuscous to fuscous-black; under 

 wing coverts with the blackish areas wider, reducing the white bars 

 to spots; breast and light areas of head more washed with light buff 

 than in adult. 



Juvenal. — Cinnamon phase: Similar to the juvenal of the white 

 phase, but with the chin, throat, breast, light areas of head ochraceous- 

 buff to cinnamon-buff. 



Natal down. — Unknown. 



Adult male.—Wmg 248-267 (257); tail 172-193 (182); culmen from 

 cere 16-18 (17); tarsus 48-52 (51); middle toe without claw 35-38 

 (36.4) mm.^ 



^^ Eight specimens from Arizona, New Mexico, and Mexico. 



