AVES FALCONID^. 



Fig. 307. 



617 



Tacliytriorcliis a/bicandatus. Adult male. Brazil, September. 34,705 American Museum 

 Natural History. About one-fourth natural size. 



General description : 



Size. — Adult male. 



Total length, about 21.00 inches. 



Wing, 17.00 inches. 



Culmen, 1.5 inches. 



Tail, 7.6 inches. 



Tarsus, 3.6 inches. 



Color. — Adult male. 



Head : Plain bluish grey, slaty or dark slaty ; darker in the region about 

 the eye ; (this body-color varies in different individuals without regard, 

 apparently, to age, i. e., all birds in this plumage may be regarded as in 

 the final adult phase). 



