This plant flower very rarely and has white flowers
Was present on the bark of Morinda pubescens.
Following reference mentions its larval host plant as :Flemingia macrophylla (Fabaceae)
Although place where this is spotted does not have record(so far) of Flemingia macrophylla. Need to check further.
https://www.mothsofindia.org/#!/sp/356883/Hemithea-tritonaria/larva-host-plants