266 TROCHILIDA. 
only been found in Honduras. The genus generally extends from Honduras to South 
Brazil. 
Compared with the genera which follow, Thalurania has a more or less deeply forked 
tail, the lateral rectrices have no white at the base, and glittering blue enters more or 
less into the coloration of the plumage of most of the species. 
1. Thalurania townsendi. 
Thalurania townsendi, Ridgw. Pr. U.S. Nat. Mus, x. p. 590°; Salv. Cat. Birds Brit. Mus. xvi. 
p. 78°. 
Supra saturate nitenti-gramineo-viridis, fronte et pileo antico lete micanti-cyaneis, humeris et plumis inter- 
scapularibus cyaneo lavatis: subtus micanti-viridis, subcaudalibus cyaneis albo limbatis ; cauda chalybeo- 
cyaneo: rostro nigro. Long. tota 3°8, ale 2-1, caude rectr. lat. 1-4, rectr. med. 1°0, rostri a rictu 0-9. 
supra omnino nitenti-viridis ; subtus sordide alba, rectricibus lateralibus albido terminatis. (Descr. maris 
et femine exempl. typ. ex Segovia R., Honduras. U.S. Nat. Mus.) . 
Hab. Honvuras, Segovia River (C. H. Townsend ! 2). 
The type specimens of this bird kindly lent us by Mr. Ridgway are the only ones we 
have seen. ‘They were obtained by Mr. C. H. Townsend during an expedition to the 
Segovia River, which forms the boundary between Honduras and Nicaragua. 
In having the under surface of the body glittering green Thalurania townsendi 
resembles the Brazilian 7. glaucopis, but the violet-blue of the shoulders of the wings 
and interscapular feathers as well as the colour of the under tail-coverts (dark blue 
edged with white) suggest that its real relationship hes with its near neighbour 
T. colombica. 
We shall look anxiously for further news of this interesting species. 
2. Thalurania colombica. 
Ornismya colombica, Bourc. Ann. Sc. Phys. et Nat. Lyon, vi. t. 6"; Rev. Zool. 1843, p. 2°. 
Thalurania columbica, Gould, P.Z.S. 1852, p. 8°; Mon. Troch. ii. t. 106 (Sept. 1858) * ; Boucard, 
P. Z. S. 1878, p. 69°; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 121°; Salv. Cat. 
Birds Brit. Mus. xvi. p. 79°. . 
Trochilus (Thalurania) venusta, Gould, P. Z. 8. 1850, p. 163 °. 
Thalurania venusta, Gould, P.Z.S. 1852, p.9°; Mon. Troch. 1. t. 108 (Sept. 1858); Lawr. 
Ann. Lye. N. Y. vii. p. 292”; ix. p. 122% 5 Scl. & Salv. P. Z. S. 1864, p. 365%; Salv. 
P. Z. S. 1867, p. 153“; 1870, p. 207°; Ibis, 1872, p. 319”. 
Supra nigra (a fronte adspecta) cupreo-viridis (a tergo adspecta), interscapuliis, humeris, fronte usque ad medium 
pilei et abdomine micanti-cyaneis, gutture toto micanti-viridi, subcaudalibus cyaneis albo marginatis ; 
cauda chalybeo-cyanea: rostro nigro. Long. tota 4:0, ale 2°05, caude rectr. med. 0°9, rectr. lat. 1°6, 
rostri a rictu 0°85, 
Q supra nitenti-viridis, pileo obscuriore et cupreo tincto, uropygio cerulescentiore, capitis lateribus et corpore 
subtus sordide albis, hypochondriis viridi lavatis, rectricibus mediis cerulescenti-viridibus lateralibus 
chalybeo-cyaneis albo terminatis. (Descr. maris et femine ex Panama. Mus. nostr.) 
Hab. Nicaracva, Chontales (Belt), La Libertad in Chontales (W. B. Richardson) ; 
