44 Genera of Humming Birds. 



The above description was taken from Elliot's Classification 

 and Synopsis of the Trochilidae. 



Genus XX. Discura, Keich. Aufz der Colib, 1853, p. 8. 



Platurus, Less. Ois. Mouch, 1829, p. 22. 



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



Discosura, Bon. Compt. Kend., 1850, vol. i., p. 84. 



Type; T. longicauda, Gmelin. 



Bill short, straight, converging near the tip to a slender point. 

 Male brilliantly coloured on the forehead and throat. White or 

 rufous band crossing the ramp 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. 



62. Discura longicauda, Gmel. Syst. Nat. 1788, vol. i., 



p. 498. 



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



Melliswga plattira, Steph. Gen. ZooL, vol. xiv., p. 242. 



Trochilus bilophus. Tern. PI. Col., No. 18, fig. 3. 



Ornismya platura, Less. Ois. Mou., 1829, p. 136. 



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



Discosura longicauda, Bon. Coûsp. 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 à 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. 



