40 FALCONID^. 
The adult birds are easily recognized on the wing fi-om their 
dark appearance. The immature are less easy to distinguish ; 
for a long time some of them were thought to be specimens. 
of A. rapax ; and I remember being considered a heretic 
in ornithological matters for saying they were young Imperial 
Eagles, at that time the diiference between A. imperialis and 
A. adalberti not being known : my opinion, however, has 
since been proved correct. 
The adults of this Eagle are very dark brown on the body 
and wings, except for the white patches on the latter, whence 
its name. The immature birds are at first of a uniform 
reddish brown, which becomes gradually lighter. They take, 
in captivity, three years to show any white in the wing, I 
am not aware of any instance of their breeding in the imma- 
ture plumage. 
16. Aquila rapax, Temm. Tawny Eagle. 
This Eagle is included in Favier's list ; but as it is very 
doubtful if he obtained it, I omit his notes, and merely state 
that I never saw one on either side of the Straits. 
17. Aquila maculata, Gmel. Spotted Eagle. 
The Spotted Eagle does not appear to have been obtained 
by Favier in Morocco. The only two specimens Avhich I have 
seen from Andalucia were both from near Seville — one in 
spotted plumage (the same mentioned by Lord Lilford and 
Mr. Saunders in ' The Ibis '), and an adult male which I got, 
killed on the 12th of November, 1870, and now in Lord 
Lilford's collection. 
18. Nisaetds fasciatus (V.). Bonelli's Eagle. 
Moorish. Teir Thum (Garlic- bird). — Favier. 
'' This, the most common Eagle near Tangier, is resident 
there, though some migrate north in February and return 
in July. They are seen alone or in pairs hunting over a wide 
extent, feeding chiefly on hares and rabbits ; they nest on 
rocks and high trees, laying in March one or two eggs, never 
more, of a rather round shape, rough and white in colour, with 
sometimes green and bluish stains. On the 29th April, 1867, 
