15. Confirmation : Hippotion echeclus.
Note FW not strongly bowed, lines straight; HW black base diagnostic but hidden at rest.
The HW tornal area is pale & the dark bands/shading match correctly.
http://en.sphingidae-museum.com/database/img/6133.jpg

Examples of the others at rest.

H. rosetta
HW tornal area pale ;FW strongly bowed, lines not so contrasted ; dark patch at anterior 2/3.
https://commons.wikimedia.org/wiki/F...phingidae).jpg

H. boerhaviae.
HW tornal area pale: FW not so strongly bowed as rosetta; mid band more contrasted; anterior may be darkish but not obvious patch.
http://tpittaway.tripod.com/china/h_boe_a1.jpg

H. rafflesi.
HW tornal area darkish pink;FW not so strongly bowed as rosetta; anterior area lightly darkened.
https://c1.staticflickr.com/3/2250/2...5b22dd07cf.jpg
http://www.thaibugs.com/wp-content/g...%20rosetta.jpg

16. No match seen with Noctuidae & Nolidae, so I have run out of option.

TL Seow :Cheers.