This is best left as Ypthima horsfieldii humei for the moment.
Ground colour whiter & sriae darker grey.
Ocelli usually well separated.
HW spot 5 & 6 subequal ,sometimes spot 5 is smaller.
Typical. https://www.butterflycircle.com/chec...r_Federick.jpg
Ypthima baldus newboldii.
Ground colour pale buff & striae more ochreous.
Ocelli often large, spots 2 & 3 more often conjoined.
HW spot 5 almost always larger than spot 6.
Typical. https://www.butterflycircle.com/chec...pair_Bobby.jpg
Eliot opined there are two species.
The original dispersal of Y. baldus into Sundaland have created several new forms in each of the main islands ie taxa horsfieldii in java, morus in Sumatra, selinuntius in Borneo & 'humei ' in Malaya.
Taxon horsfieldii in Java was elevated to a full species early on.
When Malaya rejoined the mainland ,taxon newboldi moves in ,so two taxa newboldi & humei are present.
However most authors treated taxon morus of Sumatra & taxon selinuntius of Borneo as subspecies of Y. baldus & not as ssp of Y. horsfieldi.
The taxon (taxonomic name)Ypthima horsfieldi humei is also not recognised as valid in Thailand.
Uemura studied the type specimen of taxon humei lodged in the British Museum, & concluded it is a form of taxon newboldi.
Thus the name 'humei' becomes a junior synonym of newboldi & can not be used for another taxon.
Recent DNA barcoding suggest there are some differences between the two .
If the difference is valid then a name change is needed ie Ypthima horsfieldi X.... X is a new name.
Currently the distribution of Ypthima horsfieldi is illogical.
Ypthima horsfieldi horsfieldi Java.
Ypthima horsfieldi 'humei' P. Malaysia.
ypthima baldus morus ... sumatra.
Ypthima baldus selinuntius ...Borneo.
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