44 Genera of Humming Birds. 



The above description was taken from Elliot's Classification 

 and Synopsis of the Trochilidae. 



Gexus XX. Discura, Keich. Aufz der Colib, 1858, p. 8. 



PUdurus, ].ess. Ois. Mouch, 1829, p. 22. 



Ocreatus, Gould, P.Z.S., 1846, p. 86. 



Dlscosura, Bon. Compt. Eend., 1850, vol. i., p. 84. 



Type; T. longicati da, Gmelin. 



Bill shod, straight, converging near the tip to a slender })oint. 

 ^Nlale brilliantly coloured on the forehead and throat. White or 

 rufous band crossing the rump as in all the other species of the 

 family. Tail deeply forked, the outermost rectrices bare of 

 webs near their tips, and terminating in a spatula. Sexes 

 unlike. 



Habitat. — Guiana, Brazil. 



02. DiscuKA LONGICAUDA, Gmel. Syst. Nat. 1788, vol. i., 



p. 498. 



Trochilus platurus, Lath. Ind. Ornith, 1790, vol. i., p. 317. 



Mellisuga platiira, Steph. Gen. Zool., vol. xiv., p. 242. 



Trochilus hilophus, Tem. PI. Col., No. 18, fig. 3. 



Ornismya platura, Less. Ois. Mou., 1829, p. 13(). 



Ocreatus lir/onicaudus, Gould, P.Z.S., 1846, p. 86. 



Diacosura longicauda, Bon. Consp. Gen. Av., 1850, vol. i., 

 p. 84. 



Discura, Sp. Salv. Ibis,, 1885, p. 434. 



Racket Tail, Gould. Mon. Troch,, vol. iii., p. 126. 



La Discure a raquettes, Muls. Hist. Nat. Ois. Mou., 1876, 

 vol. iii., p. 250. 



Habitat. — Guiana, Brazil. 



Male. — Head, throat and breast shining grass-green, a small 

 black spot on chin. Upperside bronzy -green, rump crossed by 

 a white band. In the specimens from Guiana, this band is 

 pale buff. Flanks golden-green, a few feathers beneath the 

 metallic green feathers of breast, silvery-green. Abdomen dark 

 brown, nearly black, washed with golden feathers, lower part 

 and undertail-coverts pale buff with white patch near the thigh. 

 Tail purplish-brown with buff shafts. Shaft of outermost ones 

 bare of webs near the tip, and terminating with a black spatula. 



