BIRDS OF NORTH AND MIDDLE AMERICA 



439 



Immature (sexes alike) .^^ — Similar to the adult, but with more of 

 the bone-brown color visible on the upperparts; with the lesser and 

 median upper wing coverts narrowly tipped with whitish, and the 

 rectrices with five blackish bands (including the subterminal one, 

 which is not very much broader than the more anterior ones). 



Natal down. — Unknown. 



Figure 31. — Spizastur melanoUucus. 



Adult ma/e.— Wing 340-386.2 (364.6); taH 230-245 (238.5); culmen 

 from cere 24.5-28 (25.9); tarsus 72-84 (77); middle toe without claw 

 49-52.5 (50.5 mm.).^^ 



Adult female— W\ng 393.7-423 (411.7); tail 230-253 (242); culmen 

 from cere 26-30 (28); tarsus 88-99 (93.4); middle toe without claw 

 56-58.5 (57.1 mm.)." 



23 Nothing is known as to the details of plumage sequence in this hawk. Under 

 this heading are put all apparently nonadult birds. 



21 Five specimens from Mexico, Nicaragua, Costa Rica, Colombia, and Brazil. 

 25 Five specimens from Mexico, Costa Rica, Panama, and British Guiana. 



