18 CLASSIFICATION OF BIRDS. 
The order Psittaci contains one suborder only. 
Suborder 138, PSITTACI. 
The Parrots may be diagnosed as follows :— 
A. Feet zygodactyle. B. Dorsal vertebre opisthocclous. 
The following combination is also diagnostic :— 
C. Young born helpless and nearly naked. D. Spinal feather-tract well defined on 
neck, and forked on upper back. EE. Deep plantar tendons galline. F. Oil- 
gland tufted or absent. 




























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The subdivision of the Psittaci is a question upon which much difference of opinion 
exists. Various attempts haye been made by Finsch, Reichenow, and others to classify 
the Parrots on external characters, and at least one ornithologist has tried to make use of 
internal characters for this purpose (Garrod, Proc. Zool. Soc. 1874, pp. 589-598). The 
characters are based upon the arrangement of the carotid arteries ; the presence or absence 
of the ambiens muscle; the presence or absence of the furecula; the presence or absence of 
the oil-gland; and the completeness or otherwise of the infraorbital septum. 
+ Character A excludes suborder 15, except the Leptosomide. Character B excludes suborder 15, except 
the Steatornithide. 
’ 
} 
Order PSITTACI. : 
: 
| 

