158 «so INSESSORES. 
Sword-bill Humming Bird. 
pair of wings. Of these, the Chestnut-tufted Co- 
quette is the most beautiful. Others again with 
crests of various forms and dimensions; some, as in 
the Delalande Humming Bird, whose crest when 
elevated measures nearly as long as the body of the 
bird. 
But the most striking difference is in the various 
forms and peculiar development of the tail. The 
Polytmus, with its long, dangling plumes, has already 
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