4 22 
Mr. J. H. Gurney's Notes on 
parts, except the head and neck, broadly barred transversely 
with grey, those of the mantle also showing dark shaft-marks 
and being narrowly tipped with white. 
I may further observe that Mr. Sharpe's note as to the 
habitat of this Eagle implies that it is restricted to South 
Africa, which is not the case : on the western side of that 
continent it has been obtained as far north ‘ as Bissao, spe¬ 
cimens from that locality being preserved in the Museums at 
Leyden* and Norwich; whilst to the east it has certainly 
occurred as far north as Zanzibar f, and probably in Abys¬ 
sinia and on the White NileJ. 
From the genus Nisaetus we may naturally pass to the 
consideration of the more typical Hawk-Eagles; but before 
doing so it will be convenient to refer to three aberrant genera, 
Spiziastur, Lophoaetus, and Neopus , each consisting of but a 
single species. 
Spiziastur melanoleucus , a native of tropical America, is 
remarkable for the extraordinary development of its inner 
and hind claws, which are the most powerful, in proportion 
to the size of the bird, of those of any species of this group ; 
but for this peculiarity it might very well be included in 
the genus Nisaetus, which it resembles in the circum¬ 
stance of its wings being proportionally longer than those 
of the more typical Hawk-Eagles, and also in the very 
slight development of its occipital crest; in common with 
the majority of the Hawk-Eagles it possesses the Asturine 
yellow iris §. 
Lophoaetus occipitalis is an African form, and remarkable for 
the extraordinary development of the occipital crest, which 
is greater, in proportion to the size of the bird, in this than 
* Vide ‘ Museum des Pays-Bas,’ Accipitres, p. 59. 
t Vide Finsch and Ilartlaub’s i Vogel Ost-Afrika’s,’ p. 47. 
t Vide Von Heuglin’s ‘ Systematised Uebersicht/ p. 7, and ‘ Ornitho- 
logie Nordost-Afrika’s,’ p. 59; it seems, however, not impossible that the 
species referred to, doubtfully, by Von Heuglin may have been Spiza'etus 
coronatus. 
§ My authority for the colour of the iris is a memorandum attached to 
a specimen obtained in Guatemala by Mr. Skinner, and preserved in the 
Norwich Museum. 
