I live in Shizuoka Prefecture, Japan. The other day on my way out I spotted this moth on the wall of my apartment building, having my camera with I took this picture. I put on a web site and had some feedback as to what it was. I know it is a Hawkmoth of, but I am not sure which. So I was kind of hoping you might be able to help me.
We had no idea what this species was either, but we did a websearch of Sphingidae Japan and found a fascinating site that appears to identify your moth as Callambulyx tatarinovii gabyae. Since we could not read the Japanese site, we then searched the moth’s name and found another site that states Callambulyx tatarinovii gabyae is endemic to Japan.