Genera of Humming Birds. 249 



tipped with white ; rest brown on inner web, green on outer 

 one. Bill black. Wings brown. 



Total length, 3iin. Wing, if. Tail, \\. Culmen, |. 



The types of this rare species are in the British Museum, 

 ■" Ex Gould Collection." They have two males, two females, 

 and one junior. It was discovered in Peru, by Mr. Matthews, 

 in 1 83 1. 



^351 Spathura cissiura, Gould, P.Z.S., 1853, P- 109. 

 Steganura cissiura, Gould, P.Z.S.^ i853j P- ioQ- 



Uralia cissiura, Muls., Hist. Nat. Ois. Mou., 1877, vol. iii., 

 p. 265. 



Scissor-tailed Racket-tail, Gould, Mon. Troch., vol. iii., 

 p. 166. 



rUralie à queue fendiie, Muls., Hist. Nat. Ois .Mou., 1877, 

 vol. iii., p. 266. 



La Spathure à queue fourchue. 



Habitat. — Peru. 



Male. — General plumage bronzy-green ; wings purplish- 

 brown ; central rectrices green, lateral steel-blue ; under 

 surface green, paler on the throat ; thighs thickly plumed and 

 of a reddish buff. 



Total length, 4iin. Wing, if. Tail, 2|. Bill, f. 



'' Gould, loc. c.'' 



I have seen the types of this species in the British Museum, 

 and was unable to see in what they differed from S. peruana. 



Genus C. Threptria, Reich, Aufz. derColib., 1854, p. 9. 



Type : T. aureliae, Bourcier and Mulsant. 



Bill straight, narrow, and acutely pointed. Nostrils exposed. 

 Wings long, reaching the end of tail. Tail even, slightly 

 rounded. Rectrices of uniform size, excepting the medians 

 Avhich are shorter. Tarsi clothed. Sexes similar. 



Habitat. — Columbia, Ecuador, and Bolivia. 



