Stigmella cathepostis is a moth of the Nepticulidae family. It is only known from Kyushu in Japan and the Russian Far East (Primorskiy Kray).
There might be up to three generations per year.
The larvae feed on Carpinus tschonoskii. They mine the leaves of their host plant. The mine consists of a linear, nearly full depth gallery which is restricted by mid-rib and lateral veins. The early part of the mine is slender, later it becomes gradually broader, and runs along veins. The mine is whitish green to whitish brown, with a dark brown frass line in centre.
References
Stigmella cathepostis Wikipedia(Text) CC BY-SA