discovered it in the province of Chacapoyas in Peru, and from 
one of whose specimens, without a number, I had previously 
described it. The arrival of this species in a living state 
should be a fresh stimulus to those who have mercantile re- 
lations with Peru, to procure Orchidaceous plants from the 
west side of the Cordilleras, for many of them, especially 
those from the valley of Lloa, are of singular beauty. 
Hitherto scarcely any of them have found their way into 
our gardens. 
I believe that Mr. Myers and Mr. Richard Harrison are 
at present the only possessors of this species, which is very 
graceful and pretty. 
O. deltoideum is nearly related to O. divaricatum, from 
which its narrow leaves and differently formed labellum suf- 
ficiently separate it. To the little known O. macranthum, 
from Guayaquil, with flowers three inches across, it is also 
closely allied ; but the hastate labellum and peculiar crest 
of that plant are, independently of the many other circum- 
stances, satisfactory distinctive characters. 
It may be expected that this species will grow well with the 
heat of a greenhouse. I found it among a general collection 
of greenhouse plants in Mr. Myers's garden, and it was in 
such good health that I can hardly doubt its preferring the 
cool temperature in which Cape and New Holland plants 
thrive, to the excessive heat and damp to which Orchidacee 
are commonly subjected. 
