Mr. R. B. Sharpe’s Catalogue of Accipitres. 319 
inches in one specimen, 10:9 in three, 11°2 in five, 11°3 in 
two, 11°4 in three, 11°5 in two, 11°6 in one, 11°7 in two, 
10°8 in one, and 12 in on ; and the culmen, without the 
cere, measured along the curve of the bill, showed the fol- 
lowing dimensions, viz., 1°3 inch in three specimens, 1°35 in 
five, 14 in six, 1°45 in four, and 1°5 in three. I have also 
taken the following measurements from six specimens of 
R. megarhynchus, viz. :— 
Wing- Culmen, 
measurement, without cere. 
in. in. 
From Peru, in the British Museum. . 12:4 1:95 * 
From Peru, in the Norwich Museum imperfect. IE 
From the Upper Amazons, in the col- 
lection of Messrs. Salvin & Godman 11:75 2-1 
From Bahia, in the same collection. . 115 2:1 
Male, from Tehuantepec, in the Nor- 
Tol AM bse aoe "Gig. oieidinin a chal Cold ere 12:4 1:95 
Female, from Tehuantepec, in the 
NonGla MONET Soin oadeoub anos 12:6 2:0 
The colour of the non-feathered parts in R. megarhynchus 
(allowing for individual variations) appears to resemble those 
of R. uncinatus, and the changes of plumage in the two species 
seem, so far as they are known, to beidentical. The nestling 
plumage of R. megarhynchus is, 1 believe, the only one with 
which we are, as yet, unacquainted ; but three young birds 
from Peru have been described by M. Taczanowski in the 
P.Z.S. for 1874, p. 551 (last paragraph), and in the P.Z.S. 
for 1879, p. 242 (last paragraph relating to this species), 
which appear to be in course of change from the nestling to 
the second stage of plumage, an intermediate phase of dress 
which occurs very frequently in R. uncinatus. Of the first 
of these specimens M. 'Taczanowski remarks, “le bec est noir, 
4 naissance de la mandibule inférieure jaunatre ; Viris brun ;” 
and of the other two, “iris est blanc dans le premier, et blanc 
sale dans le dernier.” 
_ The first of M. Taczanowski’s articles, above referred to, 
* Mr. Sharpe gives the measurement of the culmen in this specimen 
as 2°5 inches, having doubtless included the cere ; I make it, inclusive of 
the cere, 2'3 inches, 
