435 
Mr . R. B. Sharpe’s Catalogue of Accipitres. 
and from the other Hawk-Eagles to which I have hitherto 
referred, in having its extraordinarily powerful tarsi scutel- 
lated instead of feathered—a peculiarity which it shares with 
the remaining species of this group. 
I have nothing to add to Mr. Sharpe's account of the 
Harpy Eagle, except to suggest a doubt as to whether the 
young bird described by him may not have made some pro¬ 
gress towards the assumption of adult dress. I have a strong 
impression that I have seen young birds of this species with 
much less black about them than that described by Mr. 
Sharpe ; but I am not able at the present moment to refer to 
such a specimen, or to give the description of such a one in 
detail, and I will therefore pass to an allied species from 
Tropical America, Morphnus guianensis , which appears, from 
its elongated tarsi and short toes, to lead naturally to the 
next group which I shall have to notice, the Circaetince ) or 
Harrier-Eagles. 
As Mr. Sharpe does not describe the immature plumage of 
M. guianensis , I add the following particulars, which I noted 
from an immature specimen in the Brussels Museum:—• 
Entire head, back of neck, and crest pure white; entire 
mantle very pale brownish grey, finely vermiculated with 
darker markings of the same; these on the scapulars assume 
the form of six irregular transverse bars, and of three similar 
bars on the primary coverts; lower back and upper tail- 
coverts pure white; bastard wing blackish slate-colour, with 
two transverse bars and a tip of pale mottled brownish grey; 
primaries with four to five such bars (the uppermost partly 
white) and a light tip ; the secondaries and tertials with similar 
bars and a broad pale tip; tail with ten dark transverse bars, 
between which are narrow interspaces mottled with two 
shades of brownish grey, tip of tail whitish ; similar bars are 
apparent on the under surface of the tail; entire remainder 
of the under surface of the bird pure white. 
Before concluding my remarks on the Thrasaetinse, I must 
allude to two large birds of prey [Harpyopsis novce-guinece and 
Megatriorchis dorice) recently discovered in New Guinea by 
Signor D'Albertis, which I have not seen, but which, I think, 
2 h 2 
