MONOGRAPH OF THE FALCONIDA, ETC. 
5. I. australis, Kp.; F. australis, Lath., Gmel.; F. leucurus, 
Forst. pl. col. 224, young, 129 adult; Polyborus nove zeelandiae, 
Less.; F. nove zeelandie, Lath (part); Cireaétus antarctic, 
Less.—Size, an eagle. S. America and Australia. 
e. Subgenus Ibicter, Vieill.— The face and chin naked; wings 
long but not reaching the tip of the tail; 1-5 quill slenderly emar- 
ginated ; middle toe irregularly scaled, longer than the scaled part 
of the tarsus; outer toe long, longer than the inner one. The true 
Buteonine, Vulturine, and Gallinaccous type. 
6. I. aquilinus, G. Gray; F. aquilinus, Gmel.; pl. enl. 417; F. 
nudicollis, Daud.; formosus, Lath.; I. leucogaster, Vieill,—Black, 
with white tibial and under tail-covers. S. America. 
