197 



We now give a short arrangement of the genera 

 which have been already proposed by different or- 

 nithologists. Those in capitals are what Mr Swain- 

 son considers the five leading forms, those in com- 

 mon letters are the subgenera, of which one or two 

 more will be necessary in both Perdix and Cryp- 

 turus. 



The Rasores, or third order of birds, contains the 

 families Pavonidae, Tetraonidae, Cracidae, Struthio- 

 nidae, Columbidae. 



The family of Tetraonidae contains the genera and 

 subgenera 



PERDIX. 



Francolinus. 



Ortyx. 



Coturnix. 

 TETRAO. 



Lyrurus. 



Centrocercus. 



Lagopus. 



Syrrhaptes. 



Pterocles. 



Attagis ? 

 CRYPTONIX. 

 ORTYGIS. 

 CRYPTURUS. 



