This one looks like the Male. It is smaller and has pectinate antennae. The other one observed nearby is larger and has filiform antennae.
WS: 40 mm
This one though similar looking, is larger than the earlier posted one. And also in view of its filiform antennae this could be the Female.
WS: 44 mm
Host plant Plumbago zeylanica.
@karthik_83
I reared the same caterpillar and 120 hours later I observed it completing the formation of the pupa. The silken cage was formed and the last few body segments were kind of visible, and within an hour it had completely changed into what is visible in the picture, plus there was a pellet looking like frass.
This moth observed at a cold high altitude Silver Fir forest.
Altitude: 3,597 m
WS: 60 mm
WS: 50 mm
Altitude: 3,597 m