14 RAPTORIAL BIRDS 
Islands of the Indian Ocean; and our Museum is 
fortunate in also possessing all the known species of 
this genus, including some of considerable rarity—in 
the case of one of these, Zzmmnaétus borneonensis, the 
two specimens which we possess are the originals of 
the fine plate of this species in its adult and immature 
dress, given by Mr. Gould in his folio work on the 
Birds of Asia. 
The genera Sfrzastur and Pternura are limited to 
the tropical portions of the American Continent. One 
species of the genus /%ernura, which we possess, 
both in its immature and adult dress, (the Pternura 
zstdora of New Grenada,) is so rare, that neither the 
British Museum nor the celebrated collection at Ley- 
den contain an example of it. The two other species 
ef the genus (P. ornatus and P. tyrannus) which from 
their being less rare, are better known to travellers, 
were both observed by Prince Maximilian of Wied, 
during his explorations of the Brazilian forests, to be 
much annoyed by Toucans, which mobbed them as 
small birds in England sometimes mob a Kestrel or 
an Owl. <A specimen of P. ¢yrannus, obtained by this 
Naturalist, was killed whilst in the act of capturing 
an Opossum. 
The genera Lophaétus and Spizaétus are confined to 
the Continent of Africa. Each genus consists of but 
a single species, and that which constitutes the genus 
Spizaétus, S. coronatus, is one of the largest and most 
destructive Hawk-Eagles of the Old World. ‘The 
