75 [Vol. xlii. 



the difference in length between the primaries and secondaries 

 is less than the length o£ the tarsus. 



Recently Ridgway (Smithsonian Misc. Coll. vol. 72, no. 4, 

 1920) has proposed a new generic name, Oroaetus, for the 

 second Neotropical species Spizaetus isidori (Desmurs) of 

 the Catalogue, and another new generic name, Phceoaetus, 

 for the Spizaetus limnaetus group of south-eastern Asia, but 

 he did not deal with the African species. These are three 

 in number, and to show how different they are, I have 

 drawn up a table showing the proportional of the wings, 

 tail, and tarsus, taking the wing at 100 in each case : — 



Wing. 



S. omatus .... 100 

 (Type of the genus.) 



8. bellicosus .... 100 



8. coronatus , , 100 



8. africanus . . . , 100 



For S. bellicosus with its remarkable short tail and tarsus 

 we may use the generic name Polemaetus Heine, in Heine & 

 Reichenow, Nomencl. Mus. Hein. p. 270, 1890 ; type by 

 monotypy, Falco bellicosus Daud. 



For the other two African forms there seem to be no 

 generic names available. I propose, therefore, the fol- 

 lowing : — 



Stephanoaetus, gen. nov. 



Bill stout and strong with a sharp hook ; wings com- 

 paratively short and rounded, not reaching more than 

 halfway down the tail in the skin, the primaries hardly 

 exceeding the secondaries by more than 50 mm. ; the fourth, 

 fifth, and sixth the longest ; tail exceedingly long, about 

 three-quarters the length of the wing, the outer feathers 

 slightly shorter than the central ones ; tarsus stout and 

 rather short, clothed with feathers throughout to the middle 



Difference 



between the 



length of the 



primaries and 



secondaries. 



Tail. 



Tarsus 



18-5 



77-1 



25-7 



16-1 



51-6 



17-7 



6-3 



73-6 



18-6 



16-9 



70-0 



23-0 



