GENERA AND SPECIES. 161 



shoulders and under tail-coverts, and also on the 

 throat ; two central tail-feathers black, the rest 

 white, abruptly tipped with black the outer 

 ones more largely. 



Locality : Peru. In Gould's cabinet. 



Trochilus Prunelli. Dusky, with the shoulders 

 and a small gorget of steely blue; back bronzed ; 

 tail and wings black ; sides of chest white. 



Locality : Columbia. In Gould's cabinet. 



Trochilus insectivorus. (Trochilus insectivorus 

 Tchudi ?) Eorehead ornamented with a steely 

 spot; gorget green; a broad white semilunar 

 chest band ; general plumage black ; under tail- 

 coverts tinged with metallic green ; two central 

 tail-feathers black, the rest whitish, tipped with 

 black the outer ones more largely. Allied to 

 B. torquata, but distinct. 



Locality: (?) probably Peru. In Grould's cabinet 



In this genus, as is evident from the con- 

 formation of the wings and tail, the power of 

 flight must be very considerable. 



Genus AGLJGACTIS, Gould. The following 

 are the features which characterize this genus : 

 Beak straight ; wings large and powerful, extend- 

 ing beyond the tail ; the feathers of the tail are 

 singularly shaped at the extremity, the sharp 

 end of the shaft of each being slightly promi- 

 nent. 



Our descriptions of species are taken from 

 examples in Mr. Gould's cabinet. 



M 



