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DUKE OF RIVOLI’S HUMMING-BIRD. 
TrocMlus Rivolii Lesson. 
PLATE XVIII. 
L’Oiseau-mouclie Rivoli ; Ornismya Rivolii, Lesson, His. 
toire JValurelle des Oiscaux-mouches, pi. iv. 
This very splendid Humming-Bird maybe placed 
next to the last we have described, by the straight 
form of the bill ; but the form of the tail is again dif- 
ferent, in being very ample, and square at the end. 
>1. Lesson considers it undescribed, and has dedi- 
cated it to the Duke of Rivoli, in whose collec- 
tion the specimen which served for his copy was pro- 
cured. 
It is in length about four inches, of which the bill 
is an inch. The head is crowned with a beautiful 
cowl of rich violet-blue : the upper parts, breast, 
belly, and vent, are of a deep golden-green, assum- 
ing a very dark shade in some positions ; this occu- 
pies the space wherein the eye is situated, in the 
form of a narrow line to the rictus, and separates 
the rich blue of the cowl from a splendid emerald- 
green gorget, which occupies the throat and all the 
fore part of the neck, resting upon the side in a 
