A review of the RHS Monocot Database shows this publication data:
 
Oncidium insigne (Rolfe) Christenson, Orchids 71: 925 (2002).
 
Synonyms: 
Oncidium varicosum V insigne Rolfe, Orchid Rev. 6: 27 (1898).
Oncidium varicosum V moortebeekiense L.Linden, Lindenia 16: t. 767 (1906).
 
So it seems that at least for RHS Oncidium insigne is a valid taxon.
 
 
Oncidium varicosum Lindl., Edwardss Bot. Reg. 23: t. 1920 (1837).
 
Synonyms: 
 
Oncidium rodgersii Bateman, Gard. Chron. 1868: 1317 (1868).
Oncidium euxanthinum Rchb.f., Gard. Chron. 1869: 1158 (1869).
Oncidium geraense Barb.Rodr., Gen. Spec. Orchid. 2: 193 (1881).
 
 
And it seems that for RHS  Oncidium rodgersii and Oncidium euxanthinum are
but synonyms of  Oncidium varicosum
 
Hope I have helped.
 
Jose
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