370 Genera of Humming Birds. 



slightly curved at tip. Wings long, nearly reaching the end 

 of tail. Tail short, rectrices broad, pointed at tips, of the 

 same length, excepting the outermost ones which are 

 slightly shorter. Feathers of forehead projecting on culmen. 

 Nostrils partially hidden. Sexes alike. 



i'/rt'*^//^^'.— Guatemala, Central America, Panama, Colombia, 

 Ecuador, and Guiana. 



501. Threnetes LEUCURUS, Linne, Syst. Nat., 1766, vol. i., 



p. 190. 

 White-tailed Humming Bird, Lath., Gen. Syn., vol. ii., 

 P- 757- 



Polytnius lenciiriis, Grav, Gen. Birds, vol. i., p. 108. 

 Glands leiicurus, Bon., Consp., Gen. Av., 1850, p. 67. 



White-tailed Barbed throat, Gould, Mon. Troch, vol. i., 

 p. 14. 



Le Glaucis a queue blanche, Muls., Hist. Nat. Ois. Mou., 

 1873, vol. i., p. 50. 



Habitat. — Guiana. 



Male. — Upperside bronze-green, darker on the head. 

 Uppertail-coverts bronze-green, edged with gray. Median 

 rectrices bronze-green, slightly margined at tips with white, 

 laterals white, outermost ones margined and tipped more or 

 less with brownish-black. Chin and throat deep buff with the 

 centre of chin black. Lores and auriculars brown. A band 

 of black on breast just under the buff. Breast and flanks 

 shining dark green. Abdomen grayish-buff. Undertail- 

 coverts shining green, edged with gray. Wings purple. 

 Maxilla black. Manbible flesh colour with black tip. 



Total length, 4^in. Wing, 2|. Tail, i^. Culmen, i^. 



It is a very rare species. 



502. Threnetes cervinicauda, Gould, P.Z.S., 1854, p. 109. 

 Fawn-tailed Barbed-throat, Gould, Mon. Troch., vol. i., 



P- 15- 



le Glaucis a queue fauve. 



Habitat. — Colombia, Ecuador and Peru. 



Male. — Upperside shining green, passing to bronzy on the 

 Uppertail-coverts. Median rectrices bronze-green, slightly 



