Following are attempts at ID.
There are far fewer species in Singapore & the majorities are likely to be widespread species.


Arctonis nivosa. Mainland Asia.
This is recorded from Singapore.
Collinette state of this species , diaphanous like A. singaporensis, but creamy white, denser scaling & lacks the green veins.
One specimen match this well.
Bukit Panjang Sep 2020.
https://inaturalist-open-data.s3.ama...494/large.jpeg


Arctornis semihyalina. Sundaland to PNG.
Translucent without dense patches; fine transverse strations in fresh specimen; Frons brown . Palps & foreleg paler brown.Discal spot present.
https://www.mothsofborneo.com/part-5...thini_1_24.php
June 2022 MacRitchie Reservoir.
https://static.inaturalist.org/photo...3592/large.jpg
Jan 2022 Yishan
https://inaturalist-open-data.s3.ama...0115/large.jpg
Aug. 2021 Yio Chu Kang.
https://inaturalist-open-data.s3.ama...3484/large.jpg
Feb. 2020 Yishan.
https://inaturalist-open-data.s3.ama...0728/large.jpg

There are some which do not show much striations although fresh. ? Probable variant.
https://inaturalist-open-data.s3.ama...454/large.jpeg

Wear quickly destroy the patterns in sparsely scaled species.
Worn specimens.
https://inaturalist-open-data.s3.ama...328/large.jpeg
https://inaturalist-open-data.s3.ama...1714/large.jpg
https://inaturalist-open-data.s3.ama...3001/large.jpg
Male with less rounded FW.
https://inaturalist-open-data.s3.ama...429/large.jpeg