An assumption was made in the past that the dark form is B. oceia & the browner form is B. farri.
This was based on the key stating that the underside HW of B. farri is silky brown.
This assumption is too simplistic as fieldshot colour is very variable.
C&P4's key states for both species . The female is usually fully spotted.
B. farri : FW usually fully spotted in the male & always fully spotted in the female.
B. oceia: Male with spot 8 (uppermost subapical spot) usually absent & spot 4 often so. UnH faintly ochreous.
This strongly suggest all observations so far are all B. oceia.
A number of interesting observations.
https://www.inaturalist.org/observations/89619994
The 1st pic shows the FW with large rounded cellspots & a spot in space 1b, 3nd pic shows the pale areas on the antennae.
This indicate a male Caltoris bromus.