324 



GEOGRAPHICAL ZOOLOGY. 



[PART iv. 



Ethiopian regions, a few outlying species only entering the 

 Australian or the Palaearctie regions. One family (Todidse) is 

 confined to the West Indian Islands ; and another (Leptosoinidse) 

 consisting of but a single species, to Madagascar ; parallel cases 

 to the Drepanididae among the Passeres, peculiar to the Sand- 

 wich Islands, and the Apterygidse among the Struthiones, 

 peculiar to New Zealand. 



Order III.PSITTACI. 



The Parrots have been the subject of much difference of 

 opinion among ornithologists, and no satisfactory arrangement 

 of the order into families and genera has yet been reached. 

 Professor Garrod has lately examined certain points in the 

 anatomy of a large number of genera, and proposes to revolu- 

 tionize the ordinary classifications. Until, however, a general 

 examination of their whole anatomy, internal and external, has 

 been made by some competent authority, it will be unsafe to 

 adopt the new system, as we have as yet no guide to the com- 

 parative value of the characters made use of. I therefore keep 

 as much as possible to the old groups, founded on external 

 characters, only using the indications furnished by Professor 

 Garrod's paper, to determine the position of doubtful genera. 



FAMILY 76. CACATUID^. ( Genera, 35 Species.) 



GENERAL DISTRIBUTION. 



The Cacatuidae, Plyctolophidse, or Camptolophidae, as they have 

 been variously termed, comprise all those crested parrots usually 

 termed Cockatoos, together with one or two doubtful forms. 

 They are very abundant in the Australian region, more espe- 

 cially in the Austr.o-Malayan portion of it, one species inhabiting 



