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DUKE OF RIVOLPS HUMMING- BIRD. 



Trochilus Rivolii LESSON. 

 PLATE XVIII. 



L'Oiseau-mouche Rivoli ; Ornismya Rivolii, Lesson, His. 

 toire Naturette des Oiseaux-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. 

 M. 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 



