494 
ORNITHOLOGICAL SKETCHES 
dark Aquila adalberti to be a colour-variety of Aquila im- 
perialis, and the light-coloured bird to be the immature state 
of the same species. 
I give for comparison the measurements of the eagle that 
I killed at Madrid, and of seven Slavonian Imperial Eagles. 
Sex. 
Length. 
Breadth. 
Wing. 
Tail. 
Tarsus. 
Middle toe. 
cm, 
cm. 
cm. 
cm. 
cm. 
cm, 
Q &® 1 10 Ww 10 GQ 
Aquila imperialis (adalberti) from the Pardo at Madrid. 
80°5 
86 
81 
82 
82 
815 
75 
s.| 79 | 194 | 575 | 33 | wo | 65 
Aquila imperiatis from Slavonia. 
196 
213 
2031 
210°5 
223°5 
204°5 
184 
62 
58 
60 
62 
61:5 
6L5 
57 
31:2 
32 
29:8 
325 
315 
81:5 
29 
9-2 
8-5 
9-5 
9-5 
10 
10 
9-2 
