seen at night by torchlight, at rest on a leaf.
Lam Tsuen Valley, Tai Po, Hong Kong.
This is a pretty large noctuid, about 100mm across. There are only a handful of records from Hong Kong, and I think this is the first male that's been recorded in Hong Kong.
The blue around the edges of the wings is light refracted from the camera flash.
If you think this observation is inaccurate, please add an ID, participate in the quality assessment above, or describe the inaccuracy in a comment.