PSITTACI 



269 



From these facts and a few others may be derived the 

 following scheme : 



Sub-Order Psittaci : 



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

 sent. Oil gland present. 



Subf. (1.) Palgeornithinse. Paleeornis, Eclectus, Apros- 

 mictus, Eos, Tanygnathus, Prioniturus, Psittinus, 

 Loricnlns, Trickoglossus, Lorius. 

 Snbf. (2.) Cacatuinae. Orbital ring complete. 



Calopsitta, Calyptorhynchus, Licmetis, Eolo- 

 pJms, Cacatua. 

 Subf. (3.) Stringopina?. Furcula lost. 



Stringops, Euphema, Geopsittacus, Melopsitta- 

 cus, Agapornis. 



Fam. II. Psittacidse. Left carotid superficial. 

 Div. a. Ambiens present. 



