A 3-4” long green caterpillar

Last week, a GCS member sent me a SMS asking if I am interested in a 3~4” long green caterpillar.  Caterpillar of this size in a garden is most likely that of Hawk moth or Atlas moth.  On probing I found out that it has a tail and was feeding on a plant belonging to Araceae family.  This confirmed it is a Hawk moth caterpillar and most likely that of Eupanacra elegantulus.
The member was kind enough to bring the caterpillar and a cutting of the host plant to me on that evening and the caterpillar was confirmed to be that of Eupanacra elegantulus.