Mr. A. R. Wallace on the Natural Arrangement of Birds. 215 



normal form. There is also a remarkable moderation in size; 

 tor though the species arc so numerous, there are none either so 

 large or so small as are to be found in the two abnormal groups. 

 There is also a much greater uniformity in texture of plumage 



Diagram of the Affinities of the Scansores. 



BUCCONID^. 



(Megalaima.) 



RHAMPHASTIDjE. 



(Toucans.) 



Opisthocoiuus. 



CUCULID^. 

 (Cuckoos.) 



MUSOPHAGEDjE. 



(Turaco.) 



— — PICID£. 



(Woodpeckers.) 



COLIID^. 



PSITTACIDiE. 



(Parrots.) 



and in form, as well as in habits, which binds the whole into one 

 compact and natural grouj). It is also a most important pouit 



