INTRODUCTION. 15 



Mr. Vigors farther divides these families into five 

 sub-families, the falcons (Falconida), for example, 

 thus: 



1. Aquilina, Eagles. 



2. Aslurina, Hawks. 



3. Falconina, Falcons. 



4. Buteonina, Buzzards. 



5. Milvina, Kites. 



