BIRDS OF NORTH AND MIDDLE AMERICA 



371 



Juvenal (sexes alike). — Similar to the adult, but with the feathers 

 of the upperparts generally narrowly edged with dark chestnut; the 

 chin, throat, and abdomen streaked with white or buffy white, the 

 lower abdomen nearly plain tawny whitish; thighs pale tawny nar- 

 rowly barred with chestnut; the rectrices banded with dark fuscous- 

 black against grayish fuscous background, the median pair almost 

 uniform fuscous-black, the later ones whitish on the basal half or 

 more of the inner web, strikingly banded with fuscous black. 



Figure 23. — Parabuteo unicinctus. 



Natal down. — Pale pinkish tawny buff, becoming almost white on 

 the underparts, most tawny on the top of the head; bill light brown 

 horn color above and yellowish white below (Sennett). 



Adult male.— Wing 318.3-331.5 (323.2); tail 215-262 (234); culmen 

 from cere 24-28 (26.4) ; tarsus 84-90 (86-2) ; middle toe without claw 

 48^8 (48.0 mm.).^* 



Adult female. —-Wing 325-370 (358.4); tail 213-243 (232.5); culmen 

 from cere 25-29 (26.7); tarsus 80-92 (87); middle toe without claw 

 45-55 (49.7 mm.)." 



''* Three specimens from Texas. Van Rossem, Trans. San Diego See. Nat. 

 Hist., ix, 1942, 378, gives measurements of 12 males as wings 310-352 (330.8); 

 tail 207-230 (218.5 mm.). 



" Fifteen specimens from Texas, New Mexico, and Mexico (Nuevo Le6n, 

 Jalisca) . 



839094—50 25 



