152 Zoological Society. 



certain lights it appears as if it were powdered with gold and copper- 

 coloured particles ; the coppery hue prevails most on the belly ; and 

 the upper tail-coverts are of a purer green than other parts. 



Another blue-vented and white-thighed Humming-bird was de- 

 scribed under the name of 



Trochilus uropygialis. T. rostro qudm caput longiore ; caudd 

 mediocri, furcatd : colore corporis intense viridi, aureo relucente ; 

 rectricibus caudce fulgide aureo -viridibus ; guld crissoque ex jmr- 

 pureo splendide cceruleis ; abdomine nitide viridi ; alis nigrescenti- 

 bus; caudd ex purpureo atrd ; plumis femoralibus albis, laxis. 



In the female the throat and chest are somewhat rusty, with green 

 spots, and the feathers on the belly are variegated with whitish. 



This species is about the same size, and in many respects resem- 

 bles the T. cupreo-ventris, but differs in having the general colour 

 less brilliant, whilst the feathers of the belly and the upper tail- 

 coverts are more brilliant, and present that compact striated appear- 

 ance which is always observable in those feathers which give that 

 extreme brilliancy to different parts of these birds : it differs, more- 

 over, in having a blue throat, and the belly, instead of being cupre- 

 ous, is bluish-green. The upper tail-coverts in T. cupreo-ventris are 

 of the same loose character as those on the back. 



Trochilus coruscus. T. rostro brevi ; caudd latissimd, subfur- 

 catd, ex aneo fused: corpore supra, capiteque viridibus nitore au- 

 reo j tectricibus caudce cupreis ; primariis purpurascentibus ; cor- 

 pore subtus viridescente,fuscescenti-ochreo,prcesertim ad crissum, 

 tincto ; lined gulari, ad pectus tendente nitide viridi, apice purpu- 

 rascenti-rubro. 

 Long. tot. 5| una ; rostri, | ; alee, 2| ; caudce, 2^. 

 Beak about equal to the head in length ; tail slightly forked, the 

 feathers very broad ; general colour of upper parts green, with 

 golden reflections, upper tail-coverts coppery; under parts dull 

 brownish-green ; tail-feathers above and beneath rich bronze, with 

 golden brown reflections ; primaries dusky, with purple reflections : 

 a stripe, extending from the chin to the chest, is composed of com- 

 pact brilliant feathers ; those on the chin and throat are green, and 

 those beyond are purplish-red, exhibiting bluish reflections ; under 

 tail-coverts brownish-yellow ; some of the feathers are whitish ; the 

 feathers on the edge of the shoulders are varied with brownish- 

 ochre. 



The female is deficient of the flame-like mark on the throat. 



Trochilus brachyrhynchus. T. rostro qudm caput breviore ; 

 caudd brevi, nigro, cupreo et ceneo subnitente ; rectricibus utrinque 

 duabus externis cceteris paululum prcestantibus, et ad apicem albis: 

 corpore suprd, ex aureo viridi, corpore subtus albo (interdilm fla- 

 vido lavato), maculis ex aureo viridibus ornato ; primariis purpu- 

 rascentibus. 



Long. tot. 3 T 5 2 unc. ; rostri, ^; alee, 1J; caudce, 1-j 7 ^. 



In one specimen there is a rufous tint on the upper tail-coverts ; 



