Mr. R. B. Sharpens Catalogue 0 /Accipitres. 87 
these variations from the ordinary coloration of the adult 
Harpy, from which this curious specimen did not appear 
otherwise to deviate. 
In my last paper* I hazarded the conjecture that two re¬ 
markable Eaptores from New Guinea, Harpyopsis novae- 
guineae and Megatriorchis dorice, recently described by Count 
T. Salvadori, might probably belong to the Hawk-Eagles; 
but I find that, as regards the last-named species, such is not 
the case. Mr. Sharpe, who had the opportunity of examining 
the types of both these species during Count Salvadori^s recent 
visit to London, assures me that M, doriae comes nearest 
to Urotriorchis macrurus, as, indeed, had been suggested 
in Count Salvadori^’s article on this subject, and that it 
must therefore be considered a Goshawk rather than a Thra- 
saetine Eagle. Harpyopsis novae-guineae seems, on the con¬ 
trary, to be very closely allied to the genus Thrasaetus ; and 
I therefore consider it to be, like the Harpy, a bare-legged 
Hawk-Eagle. 
The Circaetinse or Harrier-Eagles, to which group I now 
propose to refer, are principally distinguished from the bare¬ 
legged section of the Hawk-Eagles by the tarsi being reticu¬ 
lated instead of scutellated; this is the case in all the six 
genera which, as it seems to me, should be included in this 
group,viz. EutriorchisjDryotriorchis, Spilornis, Herpetotheres, 
CircaetuSj and Helotarsus. In all these, except Helotarsus, the 
tarsi are also of an elongated character; and in all of them 
the head is more or less broadly crested, except in CircaetuSy 
where the nuchal feathers, though showing a tendency to a 
similar development, do not really form an actual crest. In 
Spilornisj Herpetotheres, and Circaetus the wings are of 
moderate length, though not reaching to the end of the tail; 
but in EutriorchiSy and to a somewhat less extent in Dryo- 
triorchis also, they are remarkably short, whilst the tail is 
elongated; in HelotarsuSy on the contrary, the tail is propor¬ 
tionally shorter than in any other bird of prey, and the 
wings extend considerably beyond its extremity. It may also 
be mentioned that all the birds of this group, of which the 
* Vide Ibis, 1877, p. 435. 
