Which Sphinx?

[hkmoths]

..... It is a rather dull one I'm afraid, and the hindwings are no brighter as far as I could see.

Given the lack of scales left to aid the recognition of any forewing pattern, the helpful comment on the hindwings puts this as Theretra latreillii - the similar T. clotho and T. boisduvali both have dark hindwings.

cheers,

Roger.