500 
Mr. O. Salvin on Birds 
Roraima, but is of similar form, flat-topped, with vertical 
walls, and with a long sloping talus from the foot of the walls 
to the savanna country below. It differs from Roraima 
in being wooded at the summit and in the foot-slope at one 
part giving a comparatively easy access to the top. A further 
difference is in the drainage of the summit. On Roraima 
the water falls over the edge of the plateau, forming mag¬ 
nificent cascades in the rainy season. On Twek-quay there 
are no waterfalls, and the water drains off by a cavity of great 
depth in the middle of the plateau.” (Proc. R. G. S. 1886, 
p. 453.) 
Though of much lower elevation than the forests of 
the slopes of Roraima, the woods of the summit of Twek- 
quay have yielded many, if not most, of the upland species of 
birds hitherto only known from Roraima. We thus find in 
the present collection Tardus roraimce, Microcerculus ustu- 
latus , Basileuterus roraimce, Betophaga castaneocapilla, Hylo- 
philus sclateri, Calliste whilffletyi, Myiobius roraimce, Chloro - 
pipo uniformis, Lathria streptophora, Pipreola whitelyi, Bynal- 
laxis adusta, and Aulacorhamphus whitelyanus. 
It is evident from this list that the bird-fauna of this 
mountain is but an extension of that of Roraima, as, indeed, 
a glance at the map would lead us to expect, it being a por¬ 
tion of the same mountain system. The rest of the collec¬ 
tion obtained on the lower grounds consists mainly of speci¬ 
mens of species already recorded in the preceding list. The 
additions are as follows :— 
1. Eucometis oleaginea, sp. n. 
f $ . Oleaginea; fronte, capitis lateribus et gula cinereis ; cor- 
pore subtus medialiter aurantiaco-oleagineo; alis nigri- 
canti-fuscis; remigibus cinereo, secundariis oleagineo 
extus limbatis ; cauda nigricanti-fusca; rostro corneo, 
mandibula ad apicem paullo pallidiore; pedibus plumbeis. 
Long, tota 7'7 5, alse 35, caudse rectr. med. 3*5, rectr. 
lat. 3*0, tarsi IT, rostri a rictu 0 8. 
Hab . Twek-quay Mountain, Carimang River, British 
Guiana ( Whitely ). 
Obs. E. cassini affinis, sed rostro robusto, dorso toto olea- 
