THE ORCHID REVIEW. 273 
ONCIDIUM x HAMATOCHILUM. 
Four years ago it was suggested by Mr. T. I. Potter, of St. Anne’s, 
Trinidad, that this handsome but mysterious Oncidium was a natural 
hybrid between Oncidium luridum and O. Lanceanum, and as a result 
of this communication the history. of the plant was examined in 
detail, the result being to confirm the probability of the truth 
of Mr. Potter’s suggestion (Orch. Rev., ili. pp. 174, 175). Mr. Potter 
showed that the plant occurred in a wild state in the south-western 
part of Trinidad, in the Cedros district, together with the two species 
in question, and was intermediate between them in shape and 
colour. He had also succeded in crossing the two species together arti- 
Fig 15. ONCIDIUM X H&MATOCHILUM. 
ficially, and though he had only succeeded in raising one seedling, he 
hoped that in due time it would flower, and remove the last element of 
doubt in the matter. The photograph here reproduced was afterwards 
sent by Mr. Potter, and shows the two varieties mentioned in his former 
note. It will be observed that they differ considerably in detail, the one 
on the right hand having a large amount of yellow on the lip, with the 
crimson stain confined to the centre. This has also much spotted sepals 
and petals, and more of the shape of O. luridum generally, a peculiarity 
which is said also to extend to the general habit of the plant. The other 
has more of the shape of O. Lanceanum, the sepals and petals are less 
spotted, and the crimson blotch on the lip extends much further towards 
