308 
ON THE CLASSIFICATION OP BIRDS. 
fig. 100.), the feathers closely and completely cover the 
entire length of the tarsus. The other group of typical 
eagles we arrange under 
Cuvier’s genus Harpyia, 
including in it not only the 
Harpyia destructor as the 
type, but all those arranged 
under his genus Morphnus. 
Of the two remaining ge. 
nera placed by M. Cuvier 
in the aquiline group, Cy- 
mindis, as we shall pre- 
sently show, has no connec- 
tion with it, even if its 
organisation alone is to be 
considered; while, if the 
Asturina of M. Vieillot, which we have not personally 
examined, is really an eagle, it must be a very aberrant 
one, possibly representing Cymindis and Avieeda. 
(249.) Following Harpyia, we place the subgenus 
Ihycter of Vieillot, of which the Daptrius ater of the 
same author, in our opinion, is but an aberrant species. 
The form and general appearance of Ibycter is alto- 
gether so peculiar that the genus cannot be mistaken. 
It is remarkable for three characters : 1. The very slight 
curvature of its bill {fig. 101.), which more resembles 
that of a gallinace- 
ous bird than of an 
eagle ; 2. The naked- 
ness of the face, chin, 
and part of the throat ; 
and, 3dly, the un- 
common breadth of 
its large fan- shaped 
tail. The feet are only of moderate length ; and there is 
no great strength in the toes and claws, at least in com- 
parison with what we see in the more typical eagles. M. 
Vieillot, in fact, classes this bird provisonally with the 
vultures, merely because it presents “ some analogy ” 
