EXPLANATORY INDEX. 423 



England, exhibited the peculiar structure of the throat most 

 admirably. When the monkey opens its mouth,, the de- 

 velopment of the 'hyoid' bone is easily seen. It forms a 

 kind of bony drum communicating with the wind-pipe, and 

 enabling the animal to emit those horrid yells which have 

 earned for it the popular name of Howler. 



The reader is here requested to look at the note upon the 

 '* Nondescript." 



KARABIMITT. 



HuMMiNG-BiED, Aea, or Karabimiti {Topaza pella), some- 

 times called the Crimson Topaz. — This is one of two hum- 

 ming-birds which are distinguishable by the length of two 

 tail-feathers, which are supposed to resemble the elongated 

 tails of the aras or macaws. The other species is the fiery 

 topaz {Topaza pyra), so called because the general colour of 

 the bird is flaming scarlet instead of the rich crimson which 

 distinguishes the Karabimiti. 



The food of the humming-birds was long a matter of 



