Orfhorhynchiis exilis. 

 Cynanthus cyanurus. 

 Seldsphorus scintilla. 

 Lophornis Gouldii. 



GROUP OF HUMMING-BIRDS. 

 Trdchihis Polytinus. 



Lophornis Hdence. 

 Florisiiga melHvora. 

 Heliotlvnx auritus. 

 Gouldia Popelairii. 



titles have been given to these birds which are either descriptive of the sound or endeavour 

 to imitate it. So characteristic is this humming sound, that it is not precisely the same in 

 any two species, and in many instances is, so very decided in its tone, that a practised 

 and observant ear can often detect the species of a Humming-bird by the sound which it 

 produces in flight. Eor example, Mr. Gosse records that the Black-capped Humming- 



