Mr, R. B. Sharpe's Catalogue of Accipitrea. 163 
also. The iris in this specimen is noted as yellow, This 
is the only fuliginous example I have examined in which 
the colour of the iris has been recorded; but I observe 
that Von Heuglin [loc, cit.) indicates a difference of tint 
in the irides of the two races, describing C. pectoralis as 
^^iride flavissima/^ and C, cinereus as ‘^‘^iride fulvescente;’^ 
the irides in the type specimen of RlippelTs C, funereus were 
described by him as chestnut-brown kastanienbraun "). 
I annex some notes of comparative measurements which I 
have taken from sundry specimens of C. pectoralis and C. 
cinereus; these data relate to as many specimens as the 
memoranda in my possession enable me to include in this 
comparison:— 
inches. 
Wing in 16 specimens of C. pectoralis varies from. 20'5-22*7 
„ in 8 „ C, cinereus „ „ . 19•2-22*5 
Tarsus in 18 specimens of C. pectoralis varies from . 3*4- 3*7 
„ in 8 ,, C. cinereus „ „ . 3-5- 4*1 
Middle toe s. u. in 18 specimens of C. pectoralis varies from.. 1*6- 2*2 
„ in 8 „ C. cinereus „ . 1*9- 2*4 
Culmen, exclusive of cere— 
in 10 specimens of C. pectoralis varies from . 1*5- 1*7 
in 6 „ C. cinereus „ „ . 1*9- 2*1 
It will be seen from the above figures that in the speci¬ 
mens I have examined the measurements of the culmen in C, 
cinereus constantly exceed those in C. pectoralis, and that 
the same excess of size occasionally obtains also in the 
tarsus and middle toe; and this fact, which, to a certain ex¬ 
tent, accords with the observations of Ruppell and Von 
Heuglin*, seems difficult to account for if C. pectoralis and 
C. cinereus be really but one and the same species. 
Although Von Heuglin speaks of the transverse bars on 
the tail as varying in different specimens of G, cinereus, 
and although, as already noted, I have myself found theii* 
number to be somewhat uncertain, yet the narrowness of the 
pale bars, averaging, I think, rather less than half an inch in 
* These authors appear to regard the excess of size in the tarsus in (7 
cinereus as more constant than I have found it. 
N 2 
