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 quam caput longiore; caudd 
mediocri, furcatd : colore corporis intense viridi, aureo relucente ;— 
rectricibus caude fulgidé aureo-viridibus ; guld crissoque ex pus'- 
pureo splendide ceruleis ; abdomine nitid2 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. 
Trocuitus coruscus. T. rostro brevi; caudd latissimd, subfur- 
catd, ex eneo fuscd : corpore supra, capiteque viridibus nitore au- 
reo ; tectricibus caude cupreis ; primariis purpurascentibus ; cor- 
pore subtis viridescente, fuscescenti-ochreo, presertim ad crissum, 
tincto ; lined gulari, ad pectus tendente nitid? viridi, apice purpu- 
rascenii-rubro. 
Long. tot. 54 unc. ; rostri, 2; ale, 24; caud@, 23. 
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 quam caput breviore ; 
caudd brevi, nigro, cupreo et eneo subnitente ; rectricibus utrinque 
duabus externis ceteris paululim prestantibus, et ad apicem albis : 
corpore supra, ex aureo viridi, corpore subtas albo (interdiim fla- 
vido lavato), maculis ex aureo viridibus ornato ; primartis purpu- 
rascentibus. 
Long. tot. 35%; unc. ; rostri, 4; ale, 14; caude, 144. 
In one specimen there is a rufous tint on the upper tail-coverts ; 
