I see from the Sphingidae series that T. tibetiana have been reported from Bhutan & Manipur.

They are practically identical.
Perhaps the pale line inner to the postmedial running from the apex is better defined in T. clotho.
http://sphingidae.myspecies.info/taxonomy/term/5200
http://sphingidae.myspecies.info/taxonomy/term/2805

2 & 4 where this line is very weak might be possible T. tibetiana.


TL Seow: Cheers.