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 tliis 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 labellura 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 wdll 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 Orchidaceae 

 are commonly subjected. 



