176 Lieut. C. G. Finch-Davies on [Ibis» 



the dark markings on the under surface are much more 

 numerous and also very much broader." 



As late as 1904, Erlanger again confused the two species, 

 as I have already mentioned. This was pointed out by 

 Neumann in the Bull. B. O. C. xvi. 1906, p. 112. 



I will now give some of the references which I consider 

 applicable to this species, but as my scientific library is 

 somewhat limited, I must be forgiven if my list is far from 

 complete : — 



Spizaetus ayresii J. H. Gurney Sen., Ibis, 1862, p. 149, 

 pi. iv. 



Plate and description of young or immature specimen. 

 Collected by T. Ay res in Natal. 



Spizaetus spilogaster P. L. Sclater, Ibis, 1864, p. 303 (part), 



Lophotriorchis lucani Sharpe & Bonvier, ' Bulletin de la 

 Societe Zoologique de la France,' 1877, p. 471. 



Description of young or immature from Landana, Portu- 

 guese Congo. 



Nisaetus spilogaster Gui-ney, ' List of Diurnal Birds of 

 Prey,' 1884, p. 52, and footnote (part). 



Aquila wahlbergi Sharpe, Ibis, 1898, p. 573. 



Under this name Sharpe describes a specimen ot a Hawk- 

 Eagle, collected by Sowerby in Mashonaland, as follows : — 

 '* This is a very curiously coloured individual and is evidently, 

 in my opinion, an immature bird, but it differs from all our 

 specimens in the British Museum in being white underneath 

 with a few arrow-shaped black streaks and bars. The upper 

 surface is also mottled with white tips ; the crown is white 

 streaked with dark brown, with a very evident crest of 

 pointed brown feathers.'"' 



I think this specimen is probably referable to H. ayresi; 

 it is certainly not H. wahlbergi. 



Lophotriorchis lucani Shelley, Ibis, 1901, p. 594. 



Describing a collection of birds from Nyasaland, Shelley 

 writes as follows: — "^^ This small Eagle somewhat resembles 

 Aqtiila wahlbergi in size and in having a short crest on the 

 hinder part of the crown, but may readily be distinguished 



