40 Genera of Humming Birds. 



This species resembles very much to L. delattrei, but can be 

 easily recognised by its crest which is much wider and shorter. 

 Besides, the green spots on tips of crest-feathers are much 

 larger. The green of the throat is darker and more brilliant ; 

 the line crossing the rump is pure white, and the bill is longer. 



Total length, 2f in. Wing, If. Tail, li. Culmen, i. 



In my opinion, it is a very good species, quite easy to 

 distinguish from L. delattrei. It is rare. 



The specimens which I have in my collection, were collected 

 in Bolivia by the celebrated explorer Buckley. 



GrENUS XIX. Gouldia, Bon. Compt. Rend., 1850, p. 31. 

 Popelaria, Reich. Aufz. der Col., 1853, p. 12. 

 GouldoTYiyia, Bon. Rev. and Mag. Zool., 1854, p. 257. 



Prymnacantha, Cab. and Hein. Mus. Hein.. I860., t. iii., 

 p. 64. 



Tricolopha, Heine. Journ. fur Ornith., 1863, p. 209. 



llythinia, Muls. I[ist. Nat. Ois. Mou., 1876, vol. iii., 

 p. 235. 



Type : T. langsdorffi, Vieillot. 



Bill about as long as the head. Rectrices lengthened, stiff, 

 graduating to a fine point. P orehead ornamented with metalling 

 feathers forming a sort of crest. Throat metallic. A white 

 band across the rump as all the other species of the family, a 

 tuft of white feathers on side of flanks over the thigh. Sexes 

 unlike. 



Habitat. — Veragua, Columbia, Ecuador, Peru, Bolivia, and 

 Brazil. 



57. GrOULDiA LANGSDORFFi, Bonuat and Vieill. Ency. Meth., 

 1794, vol. ii., p. 574. 



Orthorhynchus langsdorjji, Less. Man, Ornith., 1828., t. ii., 

 p. 77. 



Ornismya langsdorjji, Less. Ois. Mou., 1829, p. 102. 



Colibri hirundinaceus, Spix. Av. Bras., 1824, vol. i., p. 80. 



Mellisuga langsdorffi, Bon. Consp. Av., 1850, vol. i., p. 86. 



Prymnacantha langsdorffi, Cab. and Hein. Mus. Hein., 1860, 

 t. iii., p. 64. 



Langsdor^'s Thorn-tail, Gould. Mon. Troch., vol. iii., p. 127. 



Le Prymnacanthe de Langsdorff, Muls. Hist. Nat. Ois. Mou., 

 1876, vol. iii., p. 230. 



