PSITTACr 



269 



From these facts and a few others may be derived the 

 following scheme : — 



Sub-Order Psittaci : — 



Fam. I. Palseornithidse. Two carotids. Ambiens ab- 

 sent. Oil gland present. 



Subf. (1.) Palseornithinse. PalcBornis, Eclectus, Apros- 

 mictus, Eos, Tanygnathus, Prioniturus, Psittinus, 

 Loriculus, Trichoglossus, Lorius. 

 Subf. (2.) CacatuinsB. Orbital ring complete. 



Calopsitta, Calyptorhynchus, Licmetis, Eolo- 

 phus, Cacatua. 

 Subf. (3.) Stringopinse. Furcula lost. 



Stringops, Euphema, Geopsittacus, Melopsitta- 

 cus, Agapornis. 



Fam. II. Psittacidse. Left carotid superficial. 

 Div. a. Ambiens present. 



