172 GENERA AND SPECIES. 



the tail luminous brassy-green ; upper surface 

 the tail metallic brown, changing in some light 

 into deep indigo-blue ; bill black. 



Total length, 4f inches ; bill, I ; tail, 2. 



Locality : Bolivia. In Gould's cabinet. 



Trochilus Williami. Gorget metallic green 

 abdomen dusky, with a green reflexion ; upj 

 surface metallic green ; under surface of ti 

 steel-blue, with changing hues. In Tr. smara^ 

 dinicollis the gorget is more ample, and of 

 lighter tint. 



Locality : Columbia ; Popayan. In Gould's 

 cabinet. 



The birds of this genus are rangers of moun- 

 tain districts ; but to what elevation they ascenc 

 or whether they restrict themselves to deej 

 gorges, or elevated valleys, is a point not ve 

 clear. Further information relative to theii 

 habits is yet required. 



Genus AVOCETTINTJS, Bonaparte (Les At 

 cettes t Lesson). 



This beautiful genus contains only two 

 corded species, both characterized by the suddc 

 turning up of the anterior portion of the 

 reminding us of that of the Avocet (Recw 

 tra Avocetta, Linn.) of the fens and low coasts 

 the more eastern parts of our island. 



The Trochilus Avocetta is described and figured! 

 in the Naturalist's Library, Ornith. vol. i. p. 

 pi. 2 ; and the Trochilus recurvirostris 



