A History of North American Birds; Land Birds; Vol. 3 of 3 - Spencer Fullerton Baird; T. M. Brewer; Robert Ridgway

Gen. Char. Form robust and heavy, the wings long, and rather pointed, the tail moderate and rounded, the bill and feet strong. Bill intermediate between that of Astur and that of Parabuteo. Wing long and rather pointed, the third to fifth quill longest, the first shorter than eighth; three to four with inner webs emarginated. Tail moderate, slightly rounded.